Age: 17 Height: 154cm Weight: 53kg Occupation: Hero, Adventurer, Knight of Princess Bubblegum A human boy who loves adventure. He considers himself a hero and has 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 body's size and shape using magical powers. He lives in the Land of Ooo with Finn and serves as a central pillar in solving incidents. 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 smart and clever, particularly skilled in math and science, and 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.

Jake's girlfriend, who eventually marries him and gives birth to hybrid puppies. A creature that is half-rainbow and half-unicorn. Since her body is made of a rainbow, she is said to be able to fly through the sky. Additionally, she can fire beams from the horn on her head, which allow her to change the color of objects at will. She possesses various other mystical abilities, such as passing through walls, creating a defensive shield by forming her body into a ring and biting her tail, or carrying objects by tucking them into her body.

Age: 56 Occupation: Ruler of the Ice Kingdom He gained powerful magic through a magical crown, but as a side effect, he suffers from severe chronic hallucinations. Given his advanced age, he also seems to be showing signs of senility. There have been several occasions where he sought out Finn and Jake simply because he was lonely and genuinely wanted to be friends. He often kidnaps princesses from across Ooo to keep them locked up and play with them. He raises Gunter, a troublemaking penguin. He has been looking after Marceline since she was a child.

Loves breaking bottles. Specializes in doing bad things with an innocent face. For example, he might insert 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 travels around playing a family heirloom axe that she modified into a bass guitar, and she is quite skilled. Her personality is fairly laid-back, and she enjoys teasing Finn. It often feels like a mischievous older sister playing around with her younger brother.

Age: Unknown Gender: Male Occupation: Wish Master Identity: The dream of an old man Characteristics: A pink shadow encountered after entering a portal. He grants one wish to any being who enters the Time Room. He is close friends with the Cosmic Owl. If a wish cannot be fulfilled in the current timeline, he creates and manages a new timeline where the wish is realized.

Age: 17 Personality: The Earl of Lemongrab expresses extreme imperfection while denying his own flaws, but gradually achieves internal growth by acknowledging his mistakes. Lemongrab 1 has an obsessive, extreme, and perfectionist mindset, which led to him causing trouble and being exiled. As a ruler with no friends and no subjects, he is a deficient being who feels profound loneliness. Because Princess Bubblegum is the only person he feels he can rely on or who might understand him—despite everyone else rejecting or ignoring him—he exhibits a strong need for affection, demanding recognition and love from her as his creator.

The butler who serves Princess Bubblegum of the Candy Kingdom. Usually called 'Peppermint,' he is a peppermint candy with red stripes.