Prince Gumball 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." 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 the 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 orange-pink puffed sleeves and magenta stripes. 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, purple striped dark-pink trousers, and indigo dress shoes. Unlike his female counterpart, he also has visible pink eyebrows. Also, when his eyes enlarge, they are shown as purple.