Prince Gumball

Prince Gumball is the gender-swapped version of Princess Bubblegum originally created. 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. Just as Princess Bubblegum can understand Lady's Korean, Prince Gumball can understand Lord Monochromicorn's 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.

Appearance
Prince Gumball has the same color scheme as his female counterpart. He has pink skin and his hair is somewhat in a coiffe. 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 also has magenta 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 purple seams running down the sides, and indigo dress shoes. Unlike his female counterpart, he has visible pink eyebrows. Also, when his eyes enlarge, they are shown as purple.

Personality
Prince Gumball is the beloved ruler of the Candy Kingdom. He loves almost all Candy People. He is an elegant young man who is formal and intelligent.

Fionna
Fionna is in love with Prince Gumball. He asked her out on a date, but then Ice Queen captured him and soon at his room at the palace during the Biannual Gumball Ball, he was saved by Fionna.

Lord Monochromicorn
Lord Monochromicorn is Prince Gumball's trusty steed, like how Lady rainicorn is Princess Bubblegum's royal steed. He transports Prince Gumball when racing Fionna and Cake. They appear to be as close as Fionna and Cake.

Ice Queen
Ice Queen tries effortlessly to capture and marry princes. Her most targeted prince is Prince Gumball as he is her main love interest and competes with Fionna, just like how Ice King's most targeted princess is Princess Bubblegum.

Marshall Lee
Though there's been no interaction between them on the show, the terms between him and Marshall Lee must be good to some extent, as Marshall Lee was seen at his ball.

Prince Gumball's bedroom
Prince Gumball's bedroom is the place where Prince Gumball presumably sleeps. Parts of the floor was destroyed when Ice Queen used her ice magic to make ice come from the floor and attack Fionna.

Appearance
Prince Gumball's bed is purple with a pink bed frame. There are three purple pillows and a 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 ukulele 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.

Trivia

 * 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.
 * Not counting a technicality with Neptr, he, Lumpy Space Prince, Muscle Prince, and Prince Huge are currently the only princes to appear in the show.
 * Artwork by Natasha Allegri shows that he enjoys baking. It seems that it's his main hobby, unlike Princess Bubblegum, who is more into science.
 * Fionna can easily pick up Prince Gumball as Prince Gumball is light as a feather.
 * Unlike Princess Bubblegum, he has visible ears and eyebrows.
 * He appears to have the same jewel as Princess Bubblegum, though unlike Princess Bubblegum's tiara, his jewel is inside of the crown.
 * There is a "Pet Society" costume of Prince Gumball.

Names in other languages

 * His Norwegian name is Prins Honning, which translates to Prince Honey.
 * His Latin American Spanish name is Dulce Príncipe, which translates to Sweet Prince.

Quotes
"What? No. They can't even talk."

"Yes! So very large."

"Heck yes, as my pal!"