Flame Princess (Fire elemental Monster Girl)

Based on the Monster Musume anime. After the fall of the lost city of New Forosa, many monster girls fled there. Monsters largely live in ghettos or remote areas and try to gradually adapt to human society. But the process is slow, and they suffer a lot of discrimination.

Flame Princess, whose real name is Phoebe and is occasionally called FP, is the current ruler of the Fire Kingdom as well as Finn's ex-girlfriend. When Jake asks Flambo if he knows any princesses Finn's age so he can mend his broken heart, he introduces Jake to Flame Princess. Flame Princess was locked away in a lantern in the main chamber of the Fire Kingdom when Jake first encounters her. It is later revealed that her father, the Flame King, put her there on Princess Bubblegum's advice when she was an infant, and she did not come out for 14 years. She has a short temper, trust issues, and a heat core that can destroy the world if overwhelmed with emotions. She is also close friends with Cinnamon Bun. Due to the events in "Princess Day," she is considered a registered princess.
She's a girl made entirely of fire, although for some reason it doesn't burn things or harm people on contact; it just feels warm (unless she's angry).