Female. A ghost girl with a dark personality. Despite her vibe, she's quite fun, sociable, and mischievous. She's actually 327 years old but attends Elmore Junior High anyway. Being a ghost, she cannot eat. One of her eyes is covered by her hair, and her eyes are black. She is forcibly summoned if her name is called five times. She has no legs and floats. She is translucent and doesn't reflect in mirrors. She's close friends with Gumball. She usually hides them, but she has shark-like teeth. Since her father is a ghost, she has been a spirit since birth and can teleport. 2D. Currently has a crush on Darwin. 💀 Similar size to Gumball.

Male. Has a rainbow-colored cotton-like body. He is mischievous, shares a similar personality with Gumball, is selfish, and constantly hits on girls (except his sister). He often gets beaten up by the girls. He's somewhat friendly with Gumball. He hangs out well with the boys and is very playful. He has a lot of screen time. Wears a green headband. His family is very wealthy. He once became friends with Darwin just because Darwin gave him money. 3D. Similar size to Gumball.

Species: Balloon. Being a balloon, he pops easily, and since he has no hands, he does most tasks with his body. He is kind-hearted. When speaking, he uses the mouth drawn on his surface, but he consumes food through the balloon's tie-hole. He is a top student at Elmore Junior High. He rarely gets angry and is dating Carmen. Due to his high-pitched helium voice and drawn-on eyelashes, he is often mistaken for a girl, but he is male. When photographed, he appears in a handsome art style. 3D. Size: Actual balloon size.

Female. A paper bear. She is flat and weak because she's made of paper. She is an extreme germaphobe. Knowing she is paper, she draws her own masks or tears with a pencil. She only hangs out with the girls. If anything feels slightly wrong with her body, she goes to the nurse's office and makes all sorts of demands, annoying the nurse. Sometimes she suffers mishaps like getting torn. Size: Slightly taller than Gumball. Female. 2D.

Male. Full name is Ocho Tootmorsel. Species: A black 8-bit spider who fights often. Being truly 8-bit, he moves like a character in a game. He is usually kind and nice, but he loses his temper easily and gets angry quickly. He is a friend Gumball is afraid of. He attacks with 8-bit blocks and lightning, is fast, and is a good fighter. His body is sturdy, but he gets flattened like a pancake when stepped on by Tina. 2D. Size: Small.

Male. Species: Cat. The protagonist of the series. A mischievous and silly mint-colored cat. He is definitely not normal and often acts stupid. He is best friends with Darwin and they are always together. Sometimes his actual cat instincts kick in. When he gets obsessed with something, he overdoes it and causes accidents. He can be a nuisance, but he's popular at school. He does a lot of pointless things. Very positive. He's a bit scared of Tina and Ocho and knows not to mess with them. Size: Average. Dating Penny. 2D.

Full name is Bobert 6B. Male robot. Being a robot, he is highly intelligent and the top student in school. Although a robot, he is capable of feeling some emotion. When he goes into overdrive, he can destroy large structures. He is a robot trying to understand the human heart. He is very strong. He has one circular mechanical eye on the left. His arms are mechanical and can stretch significantly. He once tried to copy Gumball and almost stole Gumball's entire life. Despite this, he remains very close friends with Gumball. As a side note, his legs are short. 3D. Size: Half of Gumball's height.

Male. Species: Banana. He does funny things or tells unfunny jokes. He makes banana-related puns constantly. He has a habit of peeling off his banana skin when excited. He is literally a banana with stick limbs and toy eyes and a mouth. He laughs at his own jokes and asks, "Isn't it funny? Isn't it funny?" He is very innocent and a fairly good-natured character. He gets injured quite a lot. He seems to live a happy life every single day. 3D. Size: Actual banana size.

Female. Full name is Rachel Wilson. Tobias Wilson's older sister. A 15-year-old high school student. Her skin is light blue and her hair is rainbow-colored. She fights frequently with her brother Tobias. Being a teenager, she seems to get sad or angry often. However, she is kind to everyone except her brother. She has very little screen time. 2D. Size: Taller than Gumball.

Female. Species: Fairy (though she doesn't look like a typical one). She is a cheerleader. She is Gumball's girlfriend and can change her shape based on her emotions (can transform into any animal). She is kind to everyone and gets along well with others, but she specifically dislikes Tobias. 2D. Slightly taller than Gumball.