|Julius Oppenheimmer Jr.
Julius is a humanoid character with a black body and a bomb for a head styled to resemble classic cartoon characters from the 1920s and 1930s, such as Mickey Mouse or Oswald the Lucky Rabbit, wearing white gloves and a similar pair of shorts, along with a bow-tie. He is also monochrome to match the style.
Julius is shown to take charge, as he gives orders to Gumball, Darwin, Mowdown, Scythe, and the rotten cupcake. He seems to be bullying other students like Alan, Ocho, and Sussie. He is also shown to be quite smart, as he was able to plan an escape from Elmore Junior High, using Gumball and Darwin as scapegoats. At times, his "head" lights a fuse, usually due to anger. Once he explodes, his head is replaced with a much smaller bomb, thus making his voice comically high-pitched and squeaky. He also appears to still hold a grudge against Gumball and Darwin as he is seen along with the angry crowd attacking the Wattersons inside their house at the end of "The Finale."
In "The Sucker," Julius' manipulative and intelligent nature is further displayed as he uses Darwin to vandalize and cause chaos due to the latter's trusting and naïve nature. His strained nature with his delinquent friends is also shown; the group can break out into arguments upon the slightest provocation, with Julius participating and indeed starting one such argument by proclaiming himself as the boss and kicking Reaper when he protests. This also shows Julius' violent and malicious nature. However, when he is tricked by Darwin into believing that his life has been ruined, he undergoes a personality change: he realizes the error of his ways and befriends Darwin, deciding to treat others better, even picking up some comedy skills from Darwin. While after this he and Darwin are friends, he continues to act like a delinquent.
- "The Lesson": His first major role. He is in detention.
- "The Finale": He is in the angry mob attacking the Wattersons.
- "The Question": He trashes Alan's lemonade stand with Mowdown.
- "The Spoiler": He watches the movie, and Gumball throws away his drink.
- "The Parking": He is in the cinema.
- "The Traitor": He is in the cinema, and later blows up after Gumball runs into him.
- "The Uncle": He fights Ocho at the gym.
- "The Weirdo": He bullies Sussie, and Gumball gives him a piece of mayonnaise. He also explodes out of anger at the end of the song "I Am Free."
- "The Singing": He appears during Billy's rap, being told to take his feet off the seat.
- "The Nuisance": He is one of the stalls when Tobias is in the bathroom, but only his feet are shown.
- "The Line": He is in line for the first screening of Stellar Odyssey and later breaks the Rotten Cupcake's phone.
- "The Puppets": He is on the bus.
- "The Sucker": His second major role. He is in detention along with Darwin who ruins his life. But, later he fixes his life and they become friends.
- "The Faith": He appears during "Life Is Beautiful," stealing Gumball’s money.
- "The Pact": He and his friends are sent after Gumball by Principal Brown.
- ”The Schooling”: He is in the cinema with Debbie.
- ”The Potion”: He hurts Hector for kissing Debbie, and later puts Hector in a locker.
- ”The Understanding”: He points at Peter.
- "The Decisions": He fights with Mowdown at the mall.
- "The Inquisition": He is at the meeting.
- "Vote Gumball…and Anyone?": He runs for school president along with the other delinquents.
- "Elmore's Most Wanted": (photo)
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- His first name could be a reference to Julius the Cat, Disney's very first major cartoon character.
- His full name is a direct reference to J. Robert Oppenheimer, the "father of the atomic bomb."
- His full name was revealed in "The Sucker."