Monitor (Arrowverse)

Mar Novu, also known as the Monitor, is a major antagonist/anti-villain of the Arrowverse, being the only character to appear in every show in the franchise. He appears as one of the main antagonists (alongside John Deegan) of the 2018 Arrowverse crossover, Elseworlds, a supporting character in Seasons 8 and 6 of Arrow and The Flash, and a major character in the upcoming 2019 Arrowverse crossover, Crisis on Infinite Earths.

The Monitor is a powerful cosmic being who has prepared many worlds for the oncoming Crisis of 2019. To prepare them, the Monitor tested multiple worlds to see which one is worthy, but most of which had failed, except Earth 1. He also recruited Oliver Queen/Green Arrow and Lyla Michaels/Harbinger to assist him in preparing for the prevention of the destruction of the Multiverse and is preparing other heroes like Barry Allen/The Flash and Kara/Supergirl.

He is portrayed by LaMonica Garrett, who soon portray the Anti-Monitor in the upcoming Crisis on Infinite Earths.

Early Life
In the past, Mar Novu, nicknaming himself "The Monitor", Mar Novu visited many different Earths in the multiverse, testing them in an Elseworld to see which Earth should be prepared for an upcoming crisis, those that fail his Elseworld test would be destroyed. In the test, the Monitor bestowed the Book of Destiny to individuals from different Earths and then letting the chosen individuals create their Elseworld by using the Book. The Monitor, as well as a coming crisis, came under the attention of the Crescent Order.

Elseworlds
Traveling to Earth 90, the Monitor encountered numerous heroes, who opposed him. During an immense battle, the Monitor murdered them. After the battle, the Flash crawled towards the Book of Destiny on the ground. However, the Monitor grabbed the book first. As the Flash asked about his motivations behind his actions, the Monitor explained that they did this to themselves. He then opened the Book of Destiny, proclaiming they would all perish while the Flash ran away from the scene.

After testing Earth 90, the Monitor traveled to Earth 1 and appeared before Arkham Asylum Doctor John Deegan in Gotham City. When he asked for his assistance, Deegan refused and insulted him. To prove his seriousness, the Monitor destroyed Deegan's car. Having Deegan's attention, he gave him the Book of Destiny, telling him to do as he pleased with reality and watched as Deegan became amazed by the book.

Seeing that Cisco Ramon was observing this event later through a vibe, the Monitor turned to him and expressed interest, as he didn't believe Earth 1 had this capability. He then explained that things had already been set into motion that they couldn't prevent. He then observed Deegan change reality to where Oliver Queen is the Flash and Barry Allen is the Green Arrow.

Later, after the heroes had retrieved the Book of Destiny from Deegan, the Monitor appeared at a street in Central City, where he was promptly surrounded by police, and waited for the heroes to confront him. The Monitor was soon confronted by the Flash of Earth 90, The Flash of Earth 1, Green Arrow, and Supergirl of Earth 38. They demanded he help them use the Book of Destiny to set reality right, but the Monitor refused. The Flash of Earth 90 proclaimed he would not let the massacre of Earth 90 repeat on Earth 1. After expressing admiration for The Flash's persistence, the Monitor made him disappear before he could take a step.

With the other heroes realizing they were outmatched, Earth 1 Flash asked the Monitor what he was testing Earth 1 for. The Monitor explained that he was testing universes to find the right heroes to stand against a being far more powerful than himself who threatens the multiverse. He compliments them for being the first to acquire the Book of Destiny, before retrieving the book from A.R.G.U.S. with a wave of his hand. Supergirl then tried attacking him, but he simply breached her back to where she started before she could even touch him. Stating they show potential, the Monitor then departed and returned to Deegan, returning the Book of Destiny to him and telling him to think bigger.

After Deegan had altered reality once more where he was Superman, the Monitor summoned Oliver and Barry to his realm to discuss their destinies. The Monitor expressed interest in how they were able to outwit the Superman powered Deegan with no powers or abilities. When Oliver demanded to get back to his test, the Monitor described his personality and was pleased with his willingness to die and save countless others. He then explained the only way to survive this trial was to know their true self, before sending them away.

Later, Oliver, after becoming Green Arrow once again, returned to the Monitor's realm to demand him to stop the test from killing Barry and Kara Danvers, as unlike him they were true heroes and had the best chance at stopping the crisis. Impressed by his bravery, the Monitor agreed to help Oliver, so they made a deal to spare the Flash and Supergirl as Green Arrow attempts to stop Deegan from destroying reality, but in order to maintain balance of the universe, the Monitor made Green Arrow promised he would join him to stop the crisis when the time comes. The Monitor then gives Green Arrow a metaphysical arrow that is capable of destroying the Book and returning reality to normal. After the heroes defeat Deegan, the Monitor leaves Earth 1 knowing that they passed his test, and would soon have to prepare for the upcoming threat.

Preparing for the Crisis
After the Timeline changed when Team Flash destroyed Cicada's dagger, the crisis was moved up to 2019 instead of 2024. Knowing that Team Flash would want to change the timeline to prevent this, but might make things worse in the process, the Monitor destroyed the plinth in the Time Vault to prevent them from seeing the change in the future newspaper. In the process, he destroyed Nora West-Allen's message to her parents, which he believed was a necessary sacrifice.

After destroying the plinth, the Monitor traveled to Earth 38 to free a Green Martian named Malefic J'onzz from the Phantom Zone. He then urged the Martian to avenge himself against his brother who betrayed him. When Malefic asked if the Monitor would assist him, he told him he had to walk his path by himself, as he had one last place to visit. He then traveled to Lex Luthor's a dead body and began to wave a hand with interdimensional energy.

The Monitor, holding the Book of Destiny is seen inside Heyworld watching the Legends perform with magical creatures. He shakes his head in disappointment with the rest of the audience when their performance was terrible. However, when a Dragon showed up, he is seen eating popcorn in amusement, using the book as a stool.

In 2019, after the birth of Oliver's daughter, Mia Smoak, the Monitor returned to visit Oliver to collect his end of the deal. As Oliver had promised that he would give whatever the multiverse requires, he had no choice, but to keep his word and asked the Monitor what he needed to do. The Monitor revealed that Oliver must help him avert the crisis, but admitted regretfully that in exchange for countless deaths being prevented, Oliver would sacrifice himself and that future is inevitable and cannot be escaped. As he assured Felicity Smoak that in exchange for Oliver coming with him that night, she and her daughter would survive, the Monitor gave them time to say goodbye before he took Oliver with him to start their attempt to prevent the crisis. For Oliver's first mission, he sent him to Earth 2 to gather Dwarf star particles, which could only be found prominently on that Earth.

Sometime around August and September 2019, the Monitor visited Barry and Iris West-Allen in the Time Vault. Iris, realizing he destroyed Nora's message, tried to attack him, only for Barry to stop her. The Monitor acknowledged that it was an unfortunate side effect but argued he had to discourage them from hoping they could avoid the coming crisis. When Iris argued they still had five years, the Monitor revealed it had since changed from 2024 to December 10, 2019. Stating that Earth 1 would soon become the battleground for the fate of the multiverse. When Barry demanded to know how he can stop it, the Monitor insisted that the only way to stop it was for Barry to die before leaving.

When Oliver deterred from his mission on Earth 2, the Monitor confronted him. He found him in Queen-Merlyn Enterprises, about to confront Malcolm Merlyn of being the Dark Archer. He told him not to interfere on another Earth and to focus on his mission, to which Oliver explained that the Dark Archer had taken the particles and Oliver was simply attempting to retrieve them. The Monitor was unconvinced but allowed him to continue.

After Earth 2's destruction, the Monitor brought Oliver, John Diggle, and Laurel Lance to Hong Kong. When Oliver woke up, the Monitor criticized him for interfering with the events of Earth 2 by fighting Tommy Merlyn, which, according to the Monitor, led to the Earth's destruction. Oliver further interfered by saving Laurel. The Monitor then instructed Oliver to find Doctor Robert Wong. As Diggle arrived, looking for Oliver, the Monitor teleported away before he could be discovered.

The Monitor later met with Lyla, who was angry at him for not warning her about Earth 2's destruction, or that John was on Earth 2 when it was destroyed. The Monitor simply claimed that Earth 2's destruction was a necessary sacrifice, then asked her if she had Wong. She replied that she did, and the Monitor responded by saying that they could proceed by preparing Oliver for the upcoming crisis.

Aftermath
Between the Crisis in 2019 and 2040, the Monitor made a deal with Felicity such that he would reunite her and Oliver once she prepared William Clayton and Mia to take care of themselves. In 2040, after she said goodbye to her children, he would again return for Felicity. Before taking her, he warned her that this place was where there was no return. Felicity accepted it and the Monitor reunited them.

Personality
To Be Added

Trivia

 * In DC Comics, the Monitor is a powerful being who exists to observe and record any information on the Positive Matter Multiverse it was also to prepare the superheroes for the Crisis on Infinite Earths, by giving weapons to villains to test the heroes as he did in Elseworlds. When the time came, he gathered heroes and villains together to fight the Anti-Monitor, the Monitor's antimatter counterpart, set on destroying the multiverse. Decades later during the Rebirth era, it was revealed his name was Mar Novu, after the Arrowverse's version.
 * It is unknown if the Monitor can rewrite reality himself or if he needs the Book of Destiny to do that.