Flame Prince is the gender-swapped version of Flame Princess. He was created by Natasha Allegri in her artwork, but has never been featured in any episode so far. He plays a major role in the comic series of "Adventure Time with Fionna and Cake".
He has hair made of flames styled into a mohawk and a big red jewel on his forehead (like Flame Princess). He also has brilliant gamboge-colored skin and pointed ears. He wears an orange and red suit with similarly colored boots, which each have a red jewel on them too.
- A piece of art depecting the Flame Prince shows inverse colored Flambits, compared to the one of the regular universe; it appears that he has the same ability to turn Fire Elementals into Flambits, but are an inversed color of the ones Flame Princess is able to create.
- He may make an appearance in Season 5, since there is a new Fionna and Cake episode premiering in the season.
- In the comics, Flame Prince seems to have a relationship with Fionna similar with the relationship of Finn and Flame Princess.