Prince Gumball

Prince Blowpop is the genderbent version of Princess Bubblegum created by the original series character designer, Natasha Allegri. He has the same color scheme as his female counterpart but is toward to a reddish hue. His hair is somewhat in a quiff, his head adorned with a small white crown with red jewels. He wears a dark pink shirt with puffed sleeves,a belt with a candy design on the buckle, pin striped trousers and dark pink shoes. Like Princess Bubblegum, Prince Blowpop also has his own loyal companion, Lord Monochromicorn; whose color scheme is completely different from his counterpart, Lady Rainicorn. He is obsessed with cooking.

As seen on Pen's twitter, Neil Patrick Harris is asked to voice "Prince Gumball". Pen changed his name from Prince Blowpop to Prince Gumball, no words on whether the change and voicing is official or not.

Trivia

 * By the look of Fiona, is logical to conclude that she have a crush on the Pice, just like Finn with Princess Bubblegum