|William Geoffrey "Billy" Fitzgerald Kitchener Parham III
Billy is a blue blob shaped like an egg. Like most of the Elmore residents, he has two eyes, a mouth, two legs and two arms. His lips are pink-peach colored.
Like his mother, Billy is condescending and thinks of himself as superior to the rest of Elmore. He has a tendency to ridicule people, which can escalate into full-on bullying. He is notably intelligent, cultured, and socially awkward, which at one time made him get along well with Anais.
He has a tendency to question Felicity, always beginning with the word "Mother…", about whatever is going on around them. Felicity's answers are often dismissive or insulting. Despite this, Billy is extremely attached to his mother, celebrating Mother's Day every day and giving her a gift on each of these days, as shown in "The Gumball Chronicles: Mother's Day." However, he is not afraid to go against her when they disagree on something, such as their differing opinions on video games in "The Blame" or his friendship with Anais in "The Egg."
Billy is not always snobbish, as seen when he was enjoying Anais's company in "The Egg," though the attitude returned when Billy's disdain for Daisy the Donkey came up. He also tends to react like most other children his age would if scared or particularly upset, such as crying when he is intimidated by Gumball in "The Comic," or when Jamie draws on him in "The Buddy."
In "The Egg," Billy and his mother were invited to have lunch at the Wattersons' house by Nicole. He and Anais appeared to get along very well and even ended up going on an "adventure" through town, while Felicity and Nicole argued. It is shown towards the end of the episode that Billy and Anais had become very close friends and even believed that they had fallen in love with each other, but the friendship was broken upon Billy stating that he does not like Daisy the Donkey.
Because of this, Billy began to bully Anais. This is apparent in "The Pest," where Anais is very angry at Billy for picking on her. Billy admits to Gumball that he once had feelings for Anais but she did not feel the same way, causing him to hate her but he learns to accept the rejection after Gumball tells him that he will not always get everything he wants in life.
Billy appears to have taken Gumball's advice to heart and become more open-minded. Later, in "The Blame," Billy genuinely asks the other students for more information on video games, and not only questions his mother's teachings, but later confronts her about them at the PTA meeting.
- "Christmas": He is in line for Santa.
- "The Authority": He goes to the hospital with his mother.
- "The Hero": He appears in a flashback.
- "The Limit": He and his mother run out of the grocery store when Nicole goes on a rampage.
- "The Kids": He thinks Gumball and Darwin are short men trying to be cool.
- "The Extras" His first major role. He is seen in one of the skits constantly asking Felicity if they have arrived at their destination.
- "The Gripes": His mother accidentally puts him in the back of the car.
- "The Law" He is seen multiple times with his mom.
- "The Mothers": He is seen in the parking lot.
- "The Shell": He is part of the audience watching the school play.
- "The Burden": He is at the park.
- "The Butterfly": He tries getting the twenty dollar bill but gets pushed aside by his mother.
- "The Oracle": He is part of the angry mob.
- "The Spoiler": He is the one defining the title for The Screamening.
- "The Countdown": He and his mother get knocked down by Gumball, who is trying to do parkour.
- "The Egg": His second major role. He and Anais try to befriend each other for a playdate.
- "The Pest": His third major role. He begins bullying Anais which makes her furious.
- "The Comic": He is at the park.
- "The Romantic": He and his mother almost get hit by Rocky.
- "The Wicked": Mrs. Robinson throws his ice cream on the ground and drinks his tears.
- "The Traitor": Darwin pours syrup and feathers on him.
- "The Girlfriend": He runs out of the smoking bus.
- "The Love": He is singing "What is Love?"
- "The Awkwardness": He gets hit in the head by a can.
- "The Night": He appears in Hector's dream.
- "The Misunderstandings": He and his mother have lunch at Dinner.
- "The Blame": He collapses after playing a video game, which prompts Felicity to ban video games.
- "The Scam": He is at the cafeteria watching Coach's eating rampage under Carrie's possession.
- "The Disaster": He is being picked up by his mother when time freezes.
- "The Rerun": He is at the mall but this time his ice cream falls on the floor.
- "The Guy": He is going down a slide at the park.
- "The Boredom": He jumps into puddles but sinks in the third one.
- "The Loophole": Bobert shoots a lollipop out of his hands.
- "The Console": Gumball attacks him at the park.
- "The Ollie": Gumball skateboards above him, and later he is among the people laughing at Gumball.
- "The Stars": Gumball gives him one star.
- "The Menu": He is seen in the mall with his mother.
- "The Weirdo": He sees Gumball, Darwin and Sussie in the street.
- "The Singing He performs "Billy Parham in Your House."
- "The Best": He is knocked over by Gumball and Darwin.
- "The Worst": He is disgusted by Nicole when she pretends to be a man.
- "The Petals": He is seen watching Leslie streaking.
- "The Nuisance": His mother screams at Richard when he wears his swim trunks.
- "The Line": He is in the line for Stellar Odyssey and later appears at Elmore Shopping.
- "The List": He is seen in the audience watching the play.
- "The Puppets": Grady attacks him.
- "The One": He and his mother are walking in the mall parking lot.
- "The Neighbor": He appears at the park.
- "The Founder": He is part of the "Chanax: We're Listening" presentation.
- "The Schooling": He gets trampled at the Black Friday sale.
- "The Ghouls": He goes trick or treating with Banana Joe, Idaho, and Anton.
- "The Buddy": He is drawn on by Jamie.
- "The Mess": He walks by the Wattersons' house.
- "The Decisions": He and his mother fight with the drum kit guy.
- "Mother's Day": The Watterson kids ask him for advice on a gift to Nicole.
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- Billy speaks with a British accent, being one of the few supporting characters to do so.
- This is made stranger due to his mother not having a strong British accent like himself.
- "The Authority" reveals that Billy plays football.
- An orange version of him appeared in "The Mothers." It is unknown whether or not he is related to Billy.
- In "The Curse," a purple boy can be heard speaking in the same manner and voice as Billy. He can be seen with his mother on an airplane near the end of the episode.
- The Parhams are named after Joe Parham, a writer for the show.
- Billy's favorite TV show is Fireman Pete, as revealed in "The Egg."
- His full name was revealed in the same episode.
- He also states that his real first name is William, making him one of the very few characters to share their name with another character.
- His full name was revealed in the same episode.
- In "The Pest," it is revealed that he is an Elmore Junior High student.
- In "The Singing," it is revealed that he tries to teach as many people as he can to have good manners.
- Like Darwin, he has an incredibly long name.