Prince Gumball (Full name: Prince Bubba Gumball and formerly known as Prince Blowpop) is the gender-swapped version of Princess Bubblegum originally created by current series designer Natasha Allegri. After the gender-swapped characters were introduced in series of drawings and comics, they were featured in the season 3 episode "Fionna and Cake", in which it is revealed that the characters only exist in fanfiction written by the Ice King. Like Princess Bubblegum, Prince Gumball also has his own loyal companion, Lord Monochromicorn. Like PB, he also can understand his loyal companion as PB understands Korean and PG understands Morse code. Prince Gumball has shown romantic feelings for Fionna, but that was actually the Ice Queen in disguise. However, the real prince also had shown feelings for Fionna and had actually asked her out on a date.
Prince Gumball has the same color scheme as his female counterpart. He has pink skin and his hair is somewhat in a quiff. His head is adorned with a small golden crown and a blue jewel. He wears a hot pink shirt with light pink puffed sleeves and magenta slits. He has under-sleeves (accompanied by dark-pink sleeve cuffs) and a large matching collar with a small blue jewel inside a gold crest on it. He has a belt with another golden crest and a small blue jewel design on the buckle, dark-pink trousers with seams running down the sides, and indigo dress shoes. Unlike his female counterpart, he also has visible pink eyebrows. Also, when his eyes enlarge, they are shown as purple.
Prince Gumball's Bedroom
Prince Gumball's Bedroom is the place where Prince Gumball presumably sleeps. Part of the floor was destroyed when Ice Queen used her Ice Powers to make ice come from the floor and attack Fionna.
Prince Gumball's bed is purple with a pink bed frame. There are three purple pillows and an untidy red blanket. It has a carpet that goes up the steps where his bed is placed. It has some candles and a flower pot. There is a door that goes to an unknown room. There is also a pink bean bag in the corner with what appears to be a viola laying on it, and a lamp hanging over it for light. Like a typical royal bedroom, it has two castle-like windows to each side of the bed. Near the ceiling, there are many round pink drapes, there is also one drape that extends far beyond the others. There are rose petals scattered over the room. It is unknown whether they are usually there, or if he only scattered them to "welcome" Fionna.
His name was changed from "Prince Blowpop" to "Prince Gumball" because "Blow Pop" is a brand name.. However, the name is still used in some older comics and pictures prior to the name change.