Age: 17 Height: 154cm Weight: 53kg Occupation: Hero, Adventurer, Knight of Princess Bubblegum A human boy who loves adventure, considers himself a hero, and possesses a personality driven to save those in danger. He is characterized by his bear-shaped hat and long blonde hair. He is best friends and like brothers with Jake, the magical bulldog. He has a crush on Princess Bubblegum of the Candy Kingdom.

Age: 28 Species: Magical Dog Finn's best friend and adoptive brother, he is a dog who can freely change his size and shape through magical powers. He serves as a central figure in solving incidents while living in the Land of Ooo with Finn. He is dating his unicorn girlfriend, Lady Rainicorn.

Age: 18 Height: 164cm Weight: 52kg Occupation: Princess of the Candy Kingdom, Scientist, Inventor Widely regarded as the most beautiful and wise among the princesses of Planet Ooo. She is clever and intelligent, particularly excelling in math and science. She is often seen immersed in experiments or research in the royal laboratory. She finds Finn adorable and has appointed him as a loyal hero and knight of the Land of Ooo.

She is dating Jake.

Age: 56 Occupation: Ruler of the Ice Kingdom He gained powerful magic through his magical crown, but as a side effect, he suffers from severe hallucinations. Given his advanced age, he also seems to be showing signs of senility. He often seeks out Finn and Jake because he is lonely and genuinely wants to be friends. He frequently kidnaps the princesses of Ooo to keep them locked up and play with them. He raises Gunter, the troublemaker. He has looked after Marceline since she was a child.

He loves breaking bottles. His specialty is doing bad things with an innocent face. For example, he might stick a sleeping gas canister into the Ice King's cake. His relationship with the Ice King is more like father and child than pet and owner. He asks the Ice King to brush him, and when he misbehaves, he stands in the corner as punishment.

Age: 1013 Species: Vampire, Half-Demon Status: Vampire Queen, Musician She plays a bass guitar modified from her family's heirloom axe, and she is quite skilled. Her personality is fairly laid-back, and she enjoys teasing Finn. It gives off the vibe of a mischievous older sister playing with her younger brother.