Citizens of Sugar Rush, all hail the rightful ruler, King Candy.
~ Sour Bill introducing himself before he introduces King Candy.
Sour Bill is a major antagonist in Disney's 52nd full-length animated feature film Wreck-It Ralph, and one of the minor characters in Disney's 57th full-length animated feature film Ralph Breaks the Internet. He is King Candy's diminutive minion until the latter's death.
As his name suggests, Sour Bill is not exactly sweet. He is gloomy, miserable and pessimistic, so he speaks in a monotonous manner. And it is only during intense moments that he effectively conveys more emotional states. His moral state is highly questionable and controversial. He showed undoubted loyalty to King Candy, and (despite his apparent annoyance) was extremely supportive and encouraging of all of his endeavors (specifically his ongoing mission to keep Vanellope from racing) as evidenced by his facial expressions in various scenes. He is also the only individual in the game to know Vanellope was a real racer, and that her inclusion in a race would not lead to the world's destruction. His reasonings for both assisting Candy and keeping the latter's secrets confidential are unknown; whether it have been out of fear, malice, or some other form of motivation. Judging by his character, and the fact that he was quick to unenthusiastically praise Vanellope as sovereign once his memories were restored, it is heavily implied that Sour Bill simply had insufficient interest in the information to act on it. Also, he will unabashedly condone neutral acts, in relation to whom he serves.
An interesting note is that it was originally believed that Sour Bill was seemingly disconsolate as a result of a strong disliking towards King Candy. However, this is not the case. Not only was he shown to be incredibly dependable and trustworthy to the King, albeit annoyed with some of his orders, Sour Bill continues to appear depressed even after Candy's death, as seen when he unenthusiastically announces Vanellope's royal status. This could possibly mean Sour Bill's gloomy attitude is merely part of his programming.
In the video game kingdom of Sugar Rush, Sour Bill is first introduced attending the daily Random Roster Race to cordially introduce King Candy, the host of the race's opening ceremony. After the racers deposited their coins, Sour Bill is asked by the king to identify a mysterious hooded figure depositing a coin. The figure is revealed to be Vanellope, who is forbidden from racing. The king furiously orders his guards to capture her, but a taffy monster disrupts the ceremony, distracting the guards and allowing Vanellope to escape. Once apprehended by the guards, the monster is taken to King Candy's castle. Sour Bill de-taffies the monster, who is revealed to be the bad guy from the game Fix-It Felix, Jr., Wreck-It Ralph. Ralph explains that the coin Vanellope deposited was actually a medal he earned from the war game Hero's Duty and that he needs it back. The king refuses, however, as the medal is now in the game's codes, making it impossible to retrieve. The king orders Ralph to leave Sugar Rush at once, as he sets out to find Vanellope. As he does, Sour Bill silently departs, as well.
After learning Vanellope has built a kart with Ralph's assistance, King Candy and his goons try to arrest her and Ralph, but the duo manages to escape. The king orders Wynnchel and Duncan to find her, and returns to the castle. There, Candy nervously paces about in the throne room as Sour Bill attempts to ease his nerves by fanning him with a lollipop. Eventually, the donuts return and announce their failure. Knowing this could mean nothing but trouble, Sour Bill silently expresses his grief, before following the king into a hidden elevator behind the throne. The elevator takes the duo to a hidden chamber that contains the game's codes. Inside, Candy is able to retrieve Ralph's medal and journeys out to find him. In his absence, Sour Bill is left in command. While in charge, Sour Bill is visited by Fix-It Felix, Jr., himself, and is asked if he has seen any sign of Ralph. Realizing the two obviously have some sort of association, Sour Bill imprisons the handyman in order to prevent further trouble from outsiders.
Later on, Sour Bill is sent out to clean up the shattered remains of Vanellope's kart. He is confronted by Ralph, who demands to know why Vanellope was on the game's cabinet despite the supposed fact that she's a glitch. When he refuses to cooperate, Ralph begins to lick Sour Bill, who comments that Ralph's tongue felt like sandpaper. Despite Ralph threatening to do it again until he reaches Sour Bill's center, he miserably vows to take the truth to his grave, so Ralph stuffs him in his mouth. Once he is pulled out, Sour Bill finally confesses the truth and reveals that Vanellope was once a racer until King Candy tried to delete her code. When Ralph asks about the king's motives, Sour Bill is unable to answer, due to his memory loss. Nevertheless, he informs Ralph of Vanellope's whereabouts and the key to saving her, claiming it's all he knows. As Sour Bill tearfully begs for mercy, Ralph sticks him onto a giant lollipop tree.
Afterward, Vanellope is freed from her prison, King Candy is defeated, and the former glitch crosses the finish line of the Random Roster Race, thus resetting the game and restoring the memories of all the inhabitants. Sour Bill then returns (having somehow escaped the lollipop tree, though it's still stuck to his backside) and rushes to Vanellope's side upon her transformation into a princess to declare her sovereign of the land; resuming his position as her adviser.
Ralph Breaks the Internet
Six years after the death of Turbo and the Cy-Bugs, which is 6 years after the events of the first film, Sour Bill lives peacefully but after the game loses its steering ability because the wheel broke, everyone evacuates and after the game gets unplugged, Sour Bill says "I'm freaking out" in a sour and bored way.
Sour Bill appears to be a small green candy with jellybean-like hands and feet that are disembodied.
He's true to his name Sour Bill in two ways:
He has a sour deposition.
He actually tastes sour, according to Ralph.
Despite being King Candy's right-hand man, Sour Bill isn't the secondary antagonist; that role goes to the Cy-Bugs, as they were more malicious and evil and die in the climax like Turbo himself.