List of Adventure Time characters

Main characters

 * Finn the Human (voiced by Zack Shada in the pilot short where his name was Pen, by Jeremy Shada in the TV series) – Finn is a 14-year-old human boy who loves nothing more than going on adventures and saving the day. He wears a hat that covers his extremely long flowing golden hair (which he cuts off in "To Cut a Woman's Hair" and is seen to progressively grow back in following episodes). He is prone to exclamations and outbursts including "Mathematical!" and "Algebraic!". When Finn was a baby, he did a 'boom boom' leading to his adoption by Jake's parents: Joshua and Margaret, which was detailed in "Memories of Boom Boom Mountain". Considering himself a hero, Finn has a lust for adventure and swore long ago that he would help anyone in need, but being so full of energy, he has trouble in situations that require him to do tasks other than fighting. His fears include the ocean, clowns, spiders, and being judged by older people due to his age. Finn is in a relationship with Flame Princess.


 * Jake the Dog (voiced by John DiMaggio) – Jake is Finn's best friend and adoptive brother. He is a 28-year-old (in "magical dog years") shape-shifting dog. His magic powers allow him to stretch or shrink any part of his body to any shape and almost any size, ranging from becoming gigantic to becoming incredibly small. Acting as a confidant and mentor to his energetic brother (though he has a tendency to give somewhat questionable advice), Jake has a laid-back attitude in most situations, but loves adventure and will eagerly fight when he needs to. In the episode, "The Apple Thief", it is revealed that Jake used to steal bikes and purses from old ladies. His powers help Finn considerably in combat and transportation, but are also sometimes used as nothing more than jovial forms of expression. Jake is in a relationship with Lady Rainicorn, who is pregnant with their children as seen in "Lady and Peebles". He met Lady in the pilot episode and is quite skilled at playing the viola, which houses a worm called Shelby.

Recurring characters

 * Princess Bubblegum (voiced by Paige Moss in the pilot short, Hynden Walch in the TV series, Isabella Acres when turned younger) – Princess Bubblegum is a bubblegum humanoid, comparable to the inhabitants of Candy Kingdom, which she rules, who are all composed of types of desserts and candies. Her proficiency in science as well as her fluency in Korean and German are testaments to her high intelligence. While Princess Bubblegum is typically kind and well-mannered, her temper can be a powerful force when provoked. Marceline reveals that Bubblegum's first name is "Bonnibel" in "Go with Me". In "Mortal Folly", she admits that she cares about Finn and gives him a sweater she knitted to keep him warm, and in "What was Missing," it is implied that she and Marceline may have had some sort of relationship in the past. In the season 2 finale "Mortal Recoil", after being possessed by "The Lich", she is accidentally shattered and returned to life as a 13-year-old due to the doctors not having enough gum to work with, though it appears that her memories have remained intact. In "Too Young", she becomes 18 again by absorbing the parts sacrificed by her candy subjects in order to reclaim her kingdom from the Earl of Lemongrab. In season 4, "Goliad", the events have shown to have an effect on Princess Bubblegum, as she begins to feel very vulnerable, and makes a clone-Sphinx of herself named Goliad.


 * Lady Rainicorn (voiced by Dee Bradley Baker in the pilot short, Niki Yang in the TV series) – Lady Rainicorn is a half-rainbow, half-unicorn creature (a race known as the Rainicorns) and Jake's girlfriend. She can turn objects and people different colors. Her origins can be traced back according to the episode "Her Parents" in which Jake explains how Rainicorns and dogs had been battling over territory in the Crystal Dimension for centuries. The episode also alludes to Rainicorns having a taste for human flesh, when her parents attempt to eat Finn. She can fly because her body intercepts light and can "dance" on it, which also explains her movement and why she has a rainbow pattern. Jake describes her as "the Rowdy Queen" because she can have fun and fight evil. In the pilot short, she makes pigeon-like sounds to communicate, but in the TV series, she speaks Korean. In both cases, despite being unable to speak the major language depending on the dubbed versions, she is able to understand it. As the TV series goes on, especially after "Her Parents", Jake and Lady's relation continues to grow, and in the end of the episode "Lady and Peebles", it is revealed that Lady is pregnant with Jake's puppies.


 * The Ice King (voiced by John Kassir in the short, Tom Kenny in the TV series) – The Ice King is the main antagonist of the series who is around 1,000 years old. The Ice King frequently steals princesses throughout Ooo to forcefully marry them, Princess Bubblegum being his usual target. His ice-based magic abilities come from a magical crown he wears, which affects him on a mental level. Though defined as a sociopath by many, the Ice King is actually lonely and misunderstood, having a generally benevolent relationship with the penguins (primarily one named Gunter), along with the snow and ice beasts who populate his realm, and is secretly envious of Finn and Jake for being such good friends. Finn and Jake learned during the events of "Holly Jolly Secrets", Ice King was originally an antiquarian named Simon Petrikov who was taping a documentary of a crown he bought from an old dock worker in northern Scandinavia, predating the Mushroom War. Wearing the crown, Petrikov begins to lose both his mind and then his fiancée Betty, the source of his subconscious need for princesses, deteriorating in both mind and body over the years into his current state. It was during the Mushroom War that Simon, before losing his mind completely and possessing the Enchiridon at the time, met Marceline.


 * Marceline the Vampire Queen (voiced by Olivia Olson ) – Marceline is a fun-loving and mischievous 1,000-year-old vampire Queen. Marceline plays an electric bass, which she made from her family's heirloom battle-axe as revealed in "It Came from the Nightosphere", and occasionally plays musically with Finn and Jake. Unlike most vampires, she reveals that it's the color red she likes to suck out of various things, and blood is only appealing because it is red. Like a traditional vampire, she is vulnerable to sunlight and is capable of turning into a bat, varying in size. The show generally portrays her as a close friend of Finn, Jake, and The Ice King, but she often feels alone as depicted in "Marceline's Closet". It was also revealed in "Return to the Nightosphere" and "Daddy's Little Monster" that her dad desired Marceline to be the next in line to rule the Nightosphere, however she does not want to take up the position. She is a survivor of the Mushroom War as stated by series creator Pendleton Ward, and in "Memory of a Memory" a trip into Marceline's mind shows her as a child wandering around the outskirts of a destroyed city. She is the only person to ever address Bubblegum by her first name (which happens to be Bonnibel). In "What Was Missing", it is implied that she and Bubblegum may have had some sort of relationship in the past. This later caused an internet controversy over her sexual orientation. While Marceline has many things in common with Finn as seen in the episode "Go with Me?" and "Daddy's Little Monster," it was stated that Marceline likes Finn for being 'just' himself, and nothing more or less. In the episode "I Remember You", it is revealed that in her childhood Marceline was befriended by the Ice King while he was Simon Petrikov during the Mushroom War. In an alternate reality where the Lich never existed thanks to Simon Petrikov sacrificing himself to freeze the bomb, Marceline became an old woman who attempted to keep the Ice King's crown hidden before Farmland Finn found it and caused the chain of events that destroyed the world. Marceline's adult form has vampiric bite marks prominently featured on her neck in almost every scene she is in, while in numerous flashbacks and memories from the past, her neck is free of scars; to date, the events leading up to her (presumably) being turned into a vampire remain unrevealed.


 * Lumpy Space Princess (voiced by Pendleton Ward) – Lumpy Space Princess (or "LSP" for short) is the princess of Lumpy Space, an alternate dimension. Like all her people, LSP is an extraterrestrial creature known as a "Lumper" which looks like a floating purple cloud with arms and a face, and can convert other beings into Lumpers by biting them. LSP is spoiled and sarcastic, constantly seeking to improve her appearance from getting cosmetic surgery to punching herself into a ball in order to be less lumpy. In later seasons, she is shown as being proud of her "lumps" and makes it known on more than one occasion that her lumps are the source of her attractiveness. She is often shown living outdoors with salvaged furniture and appears to be homeless, because she has either run away from home, or is seeking independence from her parents. She speaks with a thick (albeit masculine) Valley Girl Accent. Her parents are the king and queen of Lumpy Space. It appears that LSP can only float above the ground and cannot fly, although she can turn this off by touching the star on her forehead. LSP's relationship to Finn and Jake has always come off as nonchalant, but in the episode "Gotcha", LSP realizes that Finn is a person of good moral standing who teaches her that beauty comes from the inside, and in her premiere episode, she reveals to Finn that he's supposed to be her real friend, not like the "fake" ones she has in Lumpy Space.


 * Beemo (voiced by Niki Yang) – Sometimes written BMO, Beemo is a sentient video game console-shaped robot that lives with Finn and Jake. Beemo is genderless. Its appearance contains elements of Vectrex, Game Boy, PocketStation, and Atari 2600 game hardware. Beemo also has the features of other household objects, such as a camera in "Conquest of Cuteness", a VHS player and alarm clock in "Holly Jolly Secrets". Beemo's "face" (front panel) can be removed in order for its synthesizer to be played manually, producing an 8-bit tune, as revealed in "What is Missing". The letters on its side spell "BMO", but it has never been stated if this actually stands for anything. Beemo can transport people into a video game by pressing a button on its face as revealed in "Guardians of Sunshine". Beemo speaks English with an East Asian accent. In the episode "Five Short Graybles", it was implied that Beemo secretly imitates human habits like brushing its teeth. While Beemo is an object used for recreation on Finn and Jake's parts, it is still considered a close friend and treated as an equal by the two.


 * Flame Princess (voiced by Jessica DiCicco) – Flame Princess is the 14-year old princess of the Fire Kingdom and is one of Finn's friends. She is currently in a relationship with Finn. Like all other inhabitants of the Fire Kingdom, she is covered with fire, the very flames emitted from her body being extensions of herself that intensify with rage. She first appeared in the Season 3 finale "Incendium", where Jake was looking for a girl to help Finn get over Princess Bubblegum. While she was referred to as being destructive by her own father, when he said "evil daughter", she has a more naive nature that prompts her to act on her emotions. In the Season 4 episode "Burning Low", it was shown that Princess Bubblegum had some sort of past relationship with Flame Princess and her kingdom. In addition, the reason of her previous arrangement was revealed to be the result of a prior settlement between her father Flame King and Princess Bubblegum. In the episode "Ignition Point", she requested a favor which indirectly led to her revealing that she hated her father, The Flame King, for imprisoning her for so many years. Furthermore, it was revealed that her family is evil and the candles requested by her were used as a method to spread the family evil ways/views to the next generation.


 * The Lich (voiced by Ron Perlman) – The Lich is an ancient, diabolical sorcerer who came into being near the end of Mushroom War via a Nuclear bomb. He tried to destroy the world but was been defeated and imprisoned by Billy within the Candy Kingdom's tree many years ago. After being freed from his amber prison by using a magic incantation to take control of a snail, the Lich sets out to regain his power and destroy Ooo, but he is killed by Finn who uses the sweater Princess Bubblegum gave him to rip off the top of his skull-collapsing his entire body. However, the Lich's disembodied spirit survived and took possession of Princess Bubblegum's body momentarily before ending up in the snail that released him after he is defeated again. Going into hiding in his snail vessel, the Lich arranged for a bear to trick Finn into giving him the Enchiridion for his master plan, to attach the jewels of the various crowns onto the book and create a portal to the wishing room. Taking Billy's body as his own to achieve his plan of wishing all life eliminated, the Lich's scheme ultimately failed when Jake uses his wish to alter the Lich's wish to send him and Finn back to their world. The Lich also plays a major role in the comic book series.

Minor characters

 * Cinnamon Bun (voiced by Dee Bradley Baker) – Cinnamon Bun is a cinnamon roll that lives in the Candy Kingdom and usually tries to impress people by doing tricks or volunteering for tasks, but usually ends up failing. Princess Bubblegum refers to him as being "Half Baked". He became the new Royal Tart Toter after the old Royal Tart Toter became senile.


 * Peppermint Butler (voiced by Steve Little) – Peppermint Butler is a peppermint candy that lives in the Candy Kingdom and is Princess Bubblegum's butler. It is revealed that he is good friends with Death and can summon a portal to the land of the dead; he also has a very dark and strange side, at one time requesting Finn and Jake's flesh. It is also implied that he has violent tendencies in "The Eyes", when he calls Finn and Jake to help him dispose of a body he "found" in his yard.


 * Tree Trunks (voiced by Polly Lou Livingston in a Southern accent) – Tree Trunks is a miniature yellow elephant friend of Finn and Jake. Tree Trunks lives in a little home in the forest surrounded by her apple orchard. Tree Trunks uses the apples in the orchard to make apple pies. One time when she was thought destroyed upon acquiring a crystal apple, she was actually transported to a dimension filled with Crystal People where she was transformed into Quartzion. Finn and Jake were able to restore her to normal and get her back to Ooo. Tree Trunks is in a relationship with a pig she met during the events of "The Apple Thief".


 * Pig (voiced by Ron Lynch) - Pig is a Pig who appears in "The Apple Thief". He later had a cameo in "Holly Jolly Secrets" and reappeared in "Dream of Love" for the first time as a main character. In that episode Tree Trunks and Pig share their feelings. They kiss many times in the episode.


 * Billy (voiced by Lou Ferrigno) - According to Pendleton Ward, Billy is "..the greatest warrior ever!". He was once a great hero who is known to have rescued Cotton Candy Princess from the Fire Count, slain an evil ocean, and fought against a giant bear. Perhaps most importantly, he is also said to have defeated the Lich with a special gauntlet he wore in his youth. He lost hope in fighting and developed a more pacifist outlook into solving the woes of the world, but in the episode "His Hero", Finn gave him his hope back. In "The Lich", the Lich kills Billy and possesses his body and tricks Finn and Jake into using the Enchiridion to open a portal into other dimensions.


 * Hunson Abadeer (voiced by Martin Olson) – Hunson is the father of Marceline and lord of the Nightosphere who possesses a pendant that infuses him with power over the Nightosphereʻs chaotic evil that gives him the ability to suck the souls out of his victims. He appears first in the episode "It Came from the Nightosphere" where Finn summons him by acting out the ritual Marceline explained to him. Hunson tries to suck all the souls out of everyone before hearing the song Marceline wrote based on him eating her French fries in the past, managing to make peace with his daughter and return to the Nightosphere. However, during the events of "Return to the Nightosphere/Daddy's Little Monster", Hunson later attempted to get Marceline to follow in his footsteps by tricking her into taking his pendant before eventually realizing his mistake and taking it back from Finn, who put it on to save Marceline from the "Chaotic Evil" that possessed the amulet, and whomever wore it.


 * Ricardio (Voiced by George Takei) - Ice King's heart which became a sentient being as the result of Ice King's attempt at a love spell. Like his source, Ricardio had desires for Princess Bubblegumʻs heart. His first appearance is in "Ricardio, The Heart Guy", after Ice King fails a love spell and Ricardio appears from Ice King. Ricardio attempted to get Princess Bubblegum's heart but Finn and Jake saved her and Ricardio returned to Ice King. Ricardio later escaped in the episode "Lady and Peebles" and was fully independent with Ice King getting a replacement heart after Bubblegum beat him in a hand to hand combat battle.


 * The Earl of Lemongrab (voiced by Justin Roiland) – More commonly called Lemongrab, he was first being Princess Bubblegum ever created, and lives in the Outer Realm. He is socially dysfunctional, with trouble interacting with Candy Kingdom citizens due to his intolerance towards anything happy or comical. In "Too Young," he takes over as ruler of the Candy Kingdom when Bubblegum is deemed too young after being de-aged in the events of "Mortal Recoil"; he ended up jailing most of the candy subjects before Bubblegum returns to her original age. In "You Made Me," when his sleep-peeping Lemongrab upsets Bubblegum, she attempts to fix him by giving him subjects to rule over, but when that fails, showing how dysfunctional his relationship with her is, Lemongrab finally calms down when Bubblegum created him a clone brother he can get along with.