Joker (DC Animated Universe)

"Without Batman, crime has no punchline."

- Joker. "What's the matter, Batman? No witty comeback? No threat? Then I'll provide the narration... I'll begin with how I peeled back the layers of the boy's mind. Oh, he bravely tried to fight it at first. You would've been proud to see him so strong. But all too soon, the serums and the shocks took their toll, and the dear lad began to share such secrets with me. Secrets that are mine alone to know... Bruce. It's true, Batsy! I know everything. And kinda like the kid who peeks at his Christmas presents, I must admit, it's sadly anti-climactic. Behind all the sturm and batarangs, you're just a little boy in a playsuit, crying for mommy and daddy! It'd be funny if it weren't so pathetic. Oh, what the heck, I'll laugh anyway. HA HA HA HA HA HAA!"

- The Joker to Batman on how he tortured Robin into insanity.

{{Quote|You've lost, Batman. Robin is mine. The last sound you'll hear will be our laughter.

The Joker (real name presumed to be Jack Napier) is the secondary antagonist of the DC Animated Universe. He is a completely insane and disturbed psychopath who seeks to cause chaos, destruction and misery where ever and when ever he can, as wells as the archenemy of Batman.

He is the main antagonist of the Batman: The Animated Series show and its sequel series The New Batman Adventures, a guest antagonist of Superman: The Animated Series, one of the two main antagonist of the Justice League series and a one-shot antagonist of the Static Shock series. He also serves as the secondary antagonist of the 1993 film Batman: Mask of the Phantasm, and the eponymous main antagonist of the 2000 film Batman Beyond: Return of the Joker. He is also an iteration of The Joker from the DC Comics books.

He was voiced by {{w|Mark Hamill}}, who also famously portrayed Luke Skywalker in the Star Wars franchise and also portrayed Skeleton King, Fire Lord Ozai, Py-Ro, Dictatious Maximus Galadrigal, Darth Bane, Kavaxas, Trickster (as well as his Arrowverse incarnation), and two other Batman villains, Tony Zucco and Ferris Boyle.

Past
The novelization of Batman: Mask of the Phantasm indicates that the man who went to become the Joker was born around 1948, being 35 around the time of the flashback events of the movie, whose present time is 1993. He became a criminal at some point to make a living, a profession which would last for the rest of his life. It's unknown what the Joker's real name was, and while it's suggested to have been Jack Napier, it's possible that this may have been another alias, as he took several during his career.

By 1983, the Joker was an unnamed assassin and chauffeur working for Salvatore Valestra, Buzz Bronski and Chuckie Sol, the high-ranking members of the Valestra mob. When Carl Beaumont, a businessman who had embezzled from the Valestra mob, was unable to pay them back, he accompanied his boss and associates to pay a visit to Beaumont, who asked Valestra one more day. Valestra reluctantly agreed, but unknown to him, Carl and his daughter Andrea fled the country that same night.

Over the years, Carl reunited the necessary money and paid Salvatore back, but he anyway ordered his hitman to take out Beaumont to make him pay with blood for his delay. Although they didn't know where exactly Carl and Andrea were hiding in Europe, they got the help of Carl's former employee Arthur Reeves, who gave them their location in exchange of funding for his councilman campaign. The man did it and after killing Beaumont, he left the house just when Andrea arrived after buying groceries, which she dropped upon seeing him. He took an apple and ate it as Andrea entered into the house and cried for her father.

Eventually, he left the Valestras and formed his own gang. One night, they robbed the Ace Chemical plant but Batman arrived, and in the ensuing scuffle, the thug fell into a vat of chemicals. The chemicals inside the vat beached his skin white, turned his hair green, made his lips bright red and completely warped and destroyed his sanity, transforming him into the Joker. After taking up his new identity, Joker would establish himself as one of the main criminal powers in Gotham and became a recurring enemy of Batman. During one instance, while placed in Arkham Asylum, the Joker manipulated his psychologist Doctor Harleen Quinzel into falling in love with him, driving her to join his gang as Harley Quinn, his chief flunky.

Batman: The Animated Series
As the Joker, he pulled numerous schemes for both his own amusement and for personal profit, such as a Christmas-themed kidnapping of Commissioner Gordon, Summer Gleeson and Harvey Bullock ("Christmas with The Joker"), filling Gotham City with his laughing gas using a garbage boat ("The Last Laugh"), planting dynamite at the birthday party of Mayor Hill's son ("Be A Clown"), poisoning all of Gotham's fish with his toxins and trying to copyright them ("The Laughing Fish") and escaping Arkham to blow up a casino that was using his name sake ("The Joker's Wild"), but Batman and Robin always managed to defeat him and send him back to Arkham.

In "Joker's Favor", Joker tried to blackmail a man named Charlie Collins after he encountered him on the highway, and threatened to kill his family if he didn't help him in his scheme to kill Commissioner Gordon during an award ceremony. Collins ended up getting the better of the cowardly psychopath, using one of his own fake explosives to trick him into giving up everything he knew about his family to Batman.

In "Almost Got 'Im", Joker, Penguin, Two-Face, Killer Croc, and Poison Ivy get together and play poker, remarking on the times in which they had nearly killed Batman. Joker, believing his story was the best, saved it for last, mocking the stories of his fellow criminals. When it was his turn, Joker pulls out a portable television set and played a recording of his failed attempt. In the tape, Joker and Harley Quinn had taken over Late Night Gotham Live, captured Batman and tried to electrocute him on live TV with an electric chair powered by the forced laughter of the kidnapped studio audience, but this attempt was foiled by Catwoman. Due to only being foiled by the appearance of Catwoman, all the other villains agree that Joker had the best story, while he simultaneously wins the poker game (by cheating). Joker then reveals that he had kidnapped Catwoman and was planning to kill her by turning her into cat food as revenge for her ruining his plan, although, he is then immediately knocked out by Batman (who was disguised as Croc the entire time).

In the movie Batman: Mask of the Phantasm​, a vigilante called The Phantasm came to Gotham and, one by one, killed the mob leaders Joker had once worked for. Batman was accused of these crimes, but the Joker doubted this and set up a trap to kill the Phantasm before he himself was targeted. Joker eventually managed to find out that the killer wasn't Batman at all and that Andrea Beaumont, daughter of the embezzler he once killed on mob orders, had taken up the identity of the Phantasm. He fought the Phantasm, but she vanished to escape in an explosion, taking the laughing Joker with her. It remained unknown what happened to him after this. But he survived off-screen and went back to do what he does best — fighting Batman and terrorizing Gotham City with his deadly jokes.

In Trial, along with other inmates in Arkham Asylum, Joker ran a sham trial for Batman with the inmates as judge and jury.

The Joker later gotten a hold of an atomic bomb, taken the mayor hostage (although this was one of the very few times that he showed affection towards Harley when he realized that she had enough ‘guts’ to kill him), and even tried to succeed as a stand-up comedian while ruining three comedians’ acts for revenge on their judgment of him as unfunny — something he could never forgive. After this, he tried to destroy all Gotham City with his henchmen, but Batman, Robin and Harley Quinn destroyed his plane and defeated him.

Superman and Financial Failure
Becoming broke and desperate, Joker and Harley Quinn stole a statue of a Chinese Dragon that turned out to be forged from Kryptonite. Using this, Joker traveled to Metropolis and put himself for hire for one billion dollars to kill Superman. Lex Luthor agreed to Joker's deal. Batman eventually fought The Joker along with the Man of Steel. Then, Joker began to annoy Luthor when he demanded to be paid more to kill both superheroes. While attempting to betray Luthor (who needless to say, had also tried to betray him) The Joker ended up fighting the World's Finest in an aircraft, the explosion of which seemed to killing him, though his body was never recovered. But he survived that fall and went back to terrorize Gotham again off screen.

He turned up alive, was captured, but was shocked when he inherited millions of dollars from a mob kingpin named Barlowe, who had always despised him. Through deception was incredibly and playing the Joker's ego and greed, Barlowe set up a trap. Joker almost literally bought his way to a clean criminal record and then lived the high life on what he believed to be hundreds of millions. It was eventually revealed that only the first ten million dollars were real, which the Joker not only blew through, but was now, as Barlowe's heir, in the sights of the IRS. Joker could not reveal and possesses him, he's been tricked without looking like the clown he was. Joker decided to pull off a heist to restart his enterprises (without using any of his calling cards or signature styles that would link him to the crime), but was foiled, like always, by Batman. As he is taken back to Arkham Asylum, Harley Quinn (disguised as a police officer) beats Joker up with a baton for abandoning her to be arrested by Batman and Batgirl in the beginning of the episode and replacing her with a Fake Harley, rather than bailing her out.

On the seventh year anniversary of the Joker's "birth", the Joker's actions turned reporter Jack Ryder into the Creeper. The Creeper, while heroic, mercilessly harassed Harley and Joker, to the point even Joker considered Creeper to be a lunatic, actually begging Batman to arrest him. Creeper captured Harley and defeated the Joker in a dump park, who was later taken in custody by Batman.

After this, Harley Quinn captured Batman and tried to kill him for obtain Joker's admiration, but he hit her and threw her through the window of the building in, believing that no one had the right to kill Batman but himself. Batman eventually frees himself and fights Joker on top of a monorail, and punched the Joker into the chimney of Ace Chemicals, apparently killing him. But for unknown reasons, he survived the mortal fall and sent some flowers and a note to Quinn.

Later life and Justice League
The Joker later planned on forming a metahuman gang from the local mutants known as "Bang Babies". Villains such as Hotstreak and Talon eagerly joined his gang. However Batman, Robin, and Dakota's own resident hero Static teamed up and escaped the Joker's death trap, arresting the Clown Prince of Crime in the process. Joker tried to shock Batman with a joy-buzzer after his defeat, only for Static to not only ignore and absorb the buzzer's power, but shock the Joker right back, only worse. Joker and his gang was arrested after that.

Not wanting anything to do with Joker after their first encounter, Lex Luthor tried to keep him out of his Injustice Gang, but he is ultimately persuaded to relent by him after Copperhead is arrested and Joker provides knowledge on Batman. Using a tracking device Batman had planted on him, Joker lured Batman to the Injustice Gang's hideout and knocks him out. With Batman now captured, Joker urges Lex to let him kill Batman, but is frustrated when he is not allowed to and then proceeds to annoy Lex as he searches through Batman's utility belt. Joker then forces Batman to watch the expected destruction of the JLA's Watchtower, knowing that Luthor would give him permission to kill Batman if his plan succeeded, but it fails and Joker is not allowed to finish Batman yet again. Knowing Batman was swaying her to his way of thinking, Joker betrays and electrocutes Cheetah into unconsciousness. During the Gang's final confrontation with the JLA, Joker uses a trick exploding doll and several marbles to attack Flash and Wonder Woman, but quickly runs away when he realizes that he's outmatched. After the rest of the Gang is defeated, Joker rushes to the basement of their warehouse base to kill Batman, only to be knocked out by Batman, who states that he could have escaped their prison at any time he wanted, but chose to stay and watch on them instead.

He discovered and entered a secret government compound dubbed Section 12. At the time, it was under the supervision of the Cadmus Project, a federal initiative to procure defenses against the Justice League in case they ever went rogue. Joker arrived at the facility and killed the staff using his Joker Venom. He then freed their captives and fashioned them as a card deck hand, dubbing them his 'Royal Flush Gang'. During his time at the facility, the Joker also came across some of Project Cadmus' secret technology, and discovered a microchip that allowed it's user to copy their DNA.

Rather than use the technology early, the Joker decided to save the technology for another time. The Joker with his new team then left the facility before purchasing air time on several networks under the moniker of "Gwynplaine Entertainment" and broadcast a live feed of Las Vegas. The Joker secretly planted several dozen extremely powerful time-bombs all throughout the city, and threatened to blow up the entire city early if anyone but the Justice League tried to stop him. Though the Justice League manage to disarm the bombs and defeat the Royal Flush Gang, the bomb stunt was merely to attract viewers throughout the world. The real plan was to use the powers of the Gang's fifth member, Ace, who could drive people insane just by looking at them in person or on TV. The Joker then transmitted Ace's thought waves across the air to render everyone under a mass psychosis. Batman confronted the Joker alone, and despite almost being driven insane by Ace's powers and receiving vicious beatings from Joker, managed to reveal to Ace that the Joker held on to a special headband used to nullify Ace's powers by Project Cadmus. Ace, in anger, used her power on the Joker and temporarily incapacitated him, rendering him temporarily catatonic.

Joker's Death
Years later, he planned one final joke on Batman after realizing the "game" was getting old. The Joker and Harley Quinn kidnapped Tim Drake (the current Robin and Dick Grayson's successor) after Tim saved an unknown woman from a criminal, unaware that it is a trap and subjected him to three weeks of torture and brainwashed him into becoming a small version of the Joker called Joker Junior, much to Batman and Batgirl's horror, also finding out all of Batman's secrets (including Batman's true identity) in the process. On top of that, he documented the whole interrogation with an old video projector and possibly slides (since he claimed he had them). Batman came to the abandoned Arkham Asylum and saw what had happened to Tim. In retaliation, Batman engaged in a bloody fight with the Joker (willing to break the Joker in two for his actions), only for the Joker to stab Batman in the knee and gloat over his success (in the edited version, he punches Batman off the edge and the blood was removed).

He gave a Bang-Flag gun to Tim to finish off the Dark Knight, but instead Tim focused his rage on the one who had broken him, and fatally shot the Joker, (in the edited version, he pushed Joker into liquids (possibly water), who slipped and grabbed the lever and pulled it down as he was slipping, electrocuting himself) and says to himself, "That's not funny! That's not..." before he dies. Tim then enters into a mental breakdown, crying whatever sanity he has left of himself as Barbara Gordon (the current Batgirl) comforts him.

The remains of the Joker were buried under Arkham, and Tim was given therapy to cope with his trauma. Commissioner Gordon learned of what happened and promised to keep it a secret, while it seemed Harley had fell into the bottomless pit and perished during the battle as well. The other people who also knew the incident were the Dark Knight's butler, Alfred Pennyworth and Bruce's first partner and the former Robin, Dick Grayson who has left for Bludhaven. One year later, Tim was finally recovered from his trauma, but Bruce forbade Tim from being Robin again and swore that he will never endanger another young partner again. Tim soon left after this, choosing to make the right decision for himself. Barbara soon retired from her career as Batgirl and went on to follow her father's footsteps as the new police commissioner of Gotham City following her father's retirement. Despite his death, Joker's legacy as a criminal mastermind and homicidal maniac would live on for years. Whilst the people of Gotham were relieved at the Joker's final and ultimate defeat, they still feared his destructive legacy. Years later several groups of criminals called the Jokerz started appearing around the globe, honoring the Clown Prince of Crime's legacy. One of the gang's members, Ghoul (who coincidentally would be the member of the Jokerz gang that would serve the newly revived Joker.) stated that there are 9,453 active Jokerz that are divided into approximately 200 separate groups. Bruce continued the rest of his crime fighting career as Batman for years after the incident a few years before his retirement in the prologue of Batman Beyond.

Legacy (Return of the Joker)
It seemed not even death itself could restrain the Joker. It turns out that before Joker died, he had implanted the microchip he stole from Cadmus encoded with his DNA, memories and personality on Tim's neck. The chip soon began to activate itself automatically, transforming Drake into the Joker. According to the Joker, any lingering memories were chalked up as bad dreams by Drake. Over time, the Joker's subconscious awakened and began to assume control of Drake's body.

Over the course of forty years, the Joker plotted his return using Drake's body. With Drake's knowledge of communications and his martial skills as Robin, Joker staged a series of corporate thefts utilizing a sub-group of the Jokerz which had formed in his absence, proving how influential he had become. With the technology, Joker created a satellite jammer and hijacked control of a Hyperion class defense satellite orbiting the planet. If any of Tim Drake's family were worried in any way, Joker would simply call on the phone with Tim's voice saying he'll be working late.

Joker then revealed himself to Bruce Wayne at a party during his return to Gotham. The new Batman managed to stop Joker from killing Bruce, but Joker escaped. After a time, Terry deduced Drake had some connection and decided to confront The Joker.

However before he could reach Joker's hideout, Joker tested the new Batman by chasing after him using his satellite to send a powerful laser at the Batmobile whilst incinerating a small part of Gotham. After stopping the beam, the new Batman tracked Joker down to his hideout (an abandoned Candy Factory called the Jolly Jack) and confronted Tim. Tim started to remember how he killed the original Joker and started to act strange; when Tim accidentally mentioned the new Batman's real name he transformed into the Joker, revealing he had deduced Batman's identity. After explaining how he survived, Joker and Batman fought.

In the skirmish, the electric joy buzzer that Joker was using gets knocked out of his hand and falls into the wiring of the jamming system, redirecting the satellite's laser straight to Joker's hideout. Batman stranded Joker within the compound and fought him one on one. In the finale, Batman taunted the Joker, saying he had only returned because he could never make the original Batman laugh. This greatly enraged Joker and he managed to trap Terry under a wooden table and started strangling him.

Joker then ordered Terry to laugh before he dies and when Joker got closer in order to hear Terry better, Terry taunts by saying "Ha ha!" and uses Joker's own toy buzzer to electrocute him on the neck. The surge destroyed the microchip, restoring Tim back to normal and destroying the Joker once and for all. After so many years of waging a one-on-one war, Batman had finally won after a long struggle, destroying the Joker forever.

Personality
The Joker was a deranged man, even prior to his chemical bath: he harbored little remorse for any murders he committed as a hitman and even intended to start his own criminal organization. After falling into a vat of chemicals and becoming the Joker, his insanity increased, making him among one of the most dangerous criminals in Gotham, attempting to commit mass murder and chaos all for the sake of jokes. He even has little regard for his own life or safety, even laughing in instances where his own death was inevitable, such as when the fairgrounds were exploding around him alongside Phantasm's preparations to kill him and during a failed evacuation from the doomed LexWing when explosive marbles were rolling towards him. He even deliberatelly aimed his gun turret at an airplane he was using to try to escape a nuclear bomb he had set to detonate, knowing he will perish just to ensure Batman couldn't disarm it. Joker also described killing as "that kind of fun" when Batman came very close to killing for the torture of Tim Drake, even stating he should have done it years ago. When Joker returned from the dead and into the future, when he tried to kill Bruce, he admitted he despised and "hated his guts". He was best described by Bruce as a "psychopath, a monster".

Despite his evident insanity, the Joker was also shown to be quite intelligent, which was best demonstrated with the Phantasm murders, where he very quickly deduced the Phantasm's true identity, Andrea Beaumont, just from hearing her name on a secretary's announcement, knowing it couldn't have been her father as he had personally made sure he was dead from his prior life as a mob hitman. Other demonstrations of his intelligence include his deliberately stealing the Laughing Dragon due to not only deducing Superman's fatal weakness to kryptonite, but also the fact that the infamous heirloom was made out of the material, and when he deliberately chose to forego his usual trademark gimmicks for his crimes, even sending a body double to the Iceberg Lounge while he went to rob the U.S. Mint of cash specifically to avoid having Batman track him down. Also, when the Injustice Gang managed to capture Batman, he repeatedly insisted that they kill Batman when they have the chance due to realizing just how much of a threat he posed to their plans. Even when he was "reborn" via Tim Drake, his intelligence hadn't died down, as evidenced by how he managed to deduce the true identity of the new Batman, as well as anticipating that the new Batman would deduce that Drake was in on his schemes. He also anticipated that Bruce Wayne had "monkey-wired" the new Batman and was monitoring everything they were saying at that point, even implying he was hoping for this in order to expose the truth to his old archnemesis that Drake was literally under Joker's control via a Cadmus chip.

The only thing equal to Joker's insanity was his massive ego. He perceives himself as the greatest comedian in the world and the greatest nemesis of the Batman, and will not hesitate to destroy anyone who claims or demonstrates otherwise. One example of this hubris is when he was booted out of a comedy show and got back at the ones responsible by hypnotizing them into becoming super villains in order to cement himself as the "funniest man in all of Gotham", only to end up a laughingstock afterwards. Another blow to his pride is when he was made to believe that he had inherited a massive fortune from a hated rival of his, only to learn that a majority of it was fake and it was a trick to get the last laugh on the Clown Prince, enraging the Joker beyond words. Another time is when Harley Quinn managed to successfully capture Batman so that she and Joker can truly live together, but Joker saw this as an insult to his profession and assaulted Harley, going as far as to push her out of a window to her possible death. Batman then admitted that he tricked Harley into calling the Joker because he knew that his ego would never allow another to kill Batman, further damaging Joker's pride.

Bruce Wayne would later reference this character trait of Joker's when advising the new Batman on how to beat Joker by referring to him as being "vain" and "loving to talk." Ultimately, it was this arrogance that led to the Joker's demise twice; the first was believing that Tim Drake, having been transformed into Joker Jr., was firmly under his control, only for the boy to resist and end up fatally shooting the Joker in the chest, with the clown using his last breath to remark his disappointment in the following events. The other time was when Terry McGinnis began insulting the Joker's sense of humor and relationship with the original Batman, causing the Joker to become even more dangerously insane and attempt to choke the boy with his bare hands, allowing Terry to destroy the chip on his neck and end his threat once and for all. Ironically, the latter instance came about after the new Batman decided, instead of blocking out Joker's taunts and powering on through (Bruce Wayne's original tactic of dealing with him), to beat Joker at his own taunts due to realizing that he himself also "liked to talk."

Owing to his more clown-like appearance, he generally uses more comedy-based elements in his crimes and plans. As such, he also tended to use abandoned or otherwise defunct toy/candy factories or warehouses with some sort of comedy/clown theme as hideouts, like Laffco Toy Factory, the defunct World of the Future Fair fairgrounds, Funnibone Shipping, and the Jolly Jack Candy Factory.

Abilities and Equipment
Throughout the years, the Joker used a wide variety of instruments to exact his comedic homicides. He is as brilliant as he is insane and he has sufficient expertise in chemistry and physics to be able to invent gadgetry and concoct elaborate schemes. His equipment included card-shaped blades, guns [of the trick and real variety], joy buzzers [which electrocuted the victim], a wide variety of laughing gases [which incapacitated the victim with laughter], and his deadly Joker Venom. Most famously, Joker had a flower attached to his suit. This flower emitted a wide variety of chemicals, depending on the situation and Joker's mood. Laughing gas and acid were popular variants, but the possibilities were limited only to the Joker's mind.

The Joker also seemed to have a strange relationship with death, constantly surviving and coming back from potentially fatal things, including long falls, explosions, and even being psychically mind-wiped, to name a few-that should by all rights have ended his career, although the last aspect may have been due to the complexity of Joker's own mind. Even when he was killed by the brainwashed Tim Drake, Joker still managed to cheat death through Tim himself, surviving long enough to come into conflict with the new Batman but was destroyed once and for all.

Originally, the Joker possessed little more than average physical strength, albeit enough to regularly hold his own against the original Batman. But upon inhabiting Tim Drake's mind, he acquired the training, conditioning, and knowledge of the original Batman and Robin, allowing him to easily outmatch the new Batman in a fist fight.

Revamp
Along with the rest of the cast, the Joker underwent a revamp when Batman: The Animated Series streamlined into The New Batman Adventures. Joker's change was relatively minor; however, he lost his trademark red lips, his hair was almost black but retains the green highlight in his hair, his eyes were turned black with white pupils, and he was made to appear physically smaller and thinner. His outfit was changed from having an orange shirt and blue bow-tie to a light green shirt and dark purple bow-tie. Audio commentary on the DVD release of Superman: the Animated Series episode World's Finest and one of the first appearances of Joker's new style, reveals that the producers of the DCAU regret the stylistic change, and admit that removing Joker's red lips was a mistake, and that doing so was Glen Murakami's idea.

The character was altered again for Batman Beyond: Return of the Joker; this design used elements from the original one along with the second design's angular style and outfit, and was later used for the character's appearances in Static Shock and Justice League.

Friends and Allies

 * Two-Face - Friend and Ally.
 * Penguin - Friend and Ally.
 * Mad Hatter - Friend and Ally.
 * Ventriloquist & Scarface - Friends and Allies.
 * Killer Croc - Ally.
 * Lex Luthor - Greatest Ally. Former enemy.
 * Cheetah - Former Ally and Teammate.
 * Solomon Grundy † - Ally and Teammate.
 * Copperhead † - Ally and Teammate.
 * Shade † - Ally and Teammate.
 * The Jokerz - Minions ('Batman Beyond' Timeline).
 * Royal Flush Gang - Allies.

Neutral

 * Poison Ivy - Usually Enemy and Occasional Ally.
 * Harley Quinn - Sometimes Girlfriend, Sidekick and Lover and sometimes enemy. Greatest ally besides Lex.

Enemies

 * Batman - Archnemesis and Greatest Foe.
 * Nightwing - Enemy.
 * Batgirl - Enemy.
 * Robin - Enemy, First Killer and Host.
 * James Gordon - Enemy and Attempted Victim.
 * Harvey Bullock - Enemy and Hostage.
 * Superman - Second Archenemy, and attempted victim.
 * Lois Lane - Enemy and Hostage.
 * Lex Luthor (Was this prior to becoming ally).
 * Cheetah
 * Daniel Turpin - Enemy.
 * Wonder Woman - Enemy.
 * The Flash - Enemy.
 * Creeper - Enemy, and victim.
 * Terry McGinnis - Enemy from the Future, second killer, and attempted victim. Second archnemesis after the events of Return of the Joker.
 * Justice League - Enemies.

Trivia

 * When Mark Hamill voiced the Joker, he used the voice of the Chief Blue Meanie as the major inspiration for his performance, since he mentioned that the Joker's grin is reminiscent of the Blue Meanies themselves.
 * The Joker is also seen in many video games based on the Batman: The Animated Series. However, his appearances in those video games are ambiguously canon within the DC Animated Universe, as video game tie-ins are generally not considered canon.
 * The Joker's appearance in the DCAU is patterned after Jack Nicholson's portrayal of the character in the 1989 movie Batman. He even shares the same real name, though it's later implied that "Jack Napier" might have been an alias as well.
 * In The New Batman Adventures episode "Mad Love", The Joker makes a reference to his voice actor's role as Luke Skywalker. Oddly enough, in the Finish and Hungarian dubs of Batman: Mask of the Phantasm he mentions that the Phantasm looks a lot like Darth Vader.
 * Tim Curry (who also portrayed It, Hexxus, and many other villains) was originally cast to play the Joker in Batman: The Animated Series. However, Curry was forced to drop out of the role after contracting bronchitis, and the role was eventually given to Mark Hamill.
 * Also, while the producers thought Curry's portrayal was fantastic, they felt it was too scary for young viewers, although Paul Dini says that Curry was also replaced as making his Joker voice was too demanding for him.
 * Mark Hamill has also voiced Joker in other media, most notably the Batman: Arkham series, playing the character in Arkham Asylum, Arkham City, and Arkham Knight, as well as the version from the animated film adaptation of Batman: The Killing Joke. This Joker, while definitely his own character, also has distinct aspects of the character as seen in the DC Animated Universe. See here for the Arkham Joker or here for the version from The Killing Joke.
 * Joker's relationship with Harley Quinn is frequently shown as abusive, and at times, very pathetic, as the affection Harley feels is usually shown to be very one-sided; as Batman put it, Joker is only capable of loving himself.
 * While retaining some of his comedic qualities, The Joker was far more evil and depraved in Batman: Mask of the Phantasm than in Batman: The Animated Series, showing for the first time his sadistic murderous tendencies. He is revealed to have killed Andrea Beaumont's father under the orders of the Valestra mob even after Beamount paid them, kills Salvatore Valestra when he comes seeking his help, poisons Arthur Reeves up to the point he renders him insane and tries to repeatedly kill Andrea and Batman upon becoming aware that the former is the Phantasm. Indeed, from The New Batman Adventures onwards, The Joker became a more deadly and dangerous enemy until reaching his highest point in Batman Beyond: Return of the Joker, where he definitely crossed the Moral Event Horizon by brainwashing and torturing Tim Drake, leaving him mentally scarred for a long time.
 * This is actually very fitting; Batman: The Animated Series was subject to censorship when it aired in FOX, as the network had strong rules regarding the show's content. As such, The Joker was initially depicted more like a troublemaker than an outright murderer (although the bombs he used in the episodes "Be A Clown" and "Harlequinade" would have certainly killed people). Likewise, the Joker venom could only be used as a mere distraction instead of a mortal weapon. However, since Batman: Mask of the Phantasm was a theatrical movie, the production team was able to skip these rules, and when all subsequent DCAU shows went to be aired on Kids WB and Cartoon Network, rules were less strict, allowing them to make more direct references to death and murder and make The Joker resemble his mainstream counterpart a bit more.
 * Despite their neutral interactions in the Batman: The Animated Series episode "Almost Got 'Im", Joker and Poison Ivy have a particular disliking for each other because of their different relationships with Harley Quinn, as Joker wants Harley Quinn to follow him in his crooked schemes and uses her as an emotional outlet, whilst Ivy wants Harley to work with her as friends and encourages her to not follow Joker (who would betray her on a whim).
 * Although not confirmed, it's possible that The Joker suffers from Objectum sexuality, given his apparent attraction to Hazel the Maid, a cooking animatronic from the World of the Future Fair he maintained in Batman: Mask of the Phantasm, flirting with her and even patting her on the butt. However, this is beyond anyone's speculation.
 * Given that his birthdate has been given as 1948, and that Batman Beyond: Return of the Joker takes place around 2041, it can be deduced that hadn't his physical body died at the hands of Tim Drake, the Joker would have been 93 years old by this time.
 * While not as obsessed as Calendar Man, Joker is fond of unleashing schemes on holidays, notably April Fools' Day, Christmas and New Year's.

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Joker (DC Animated Universe)