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Official Site: Cartoon Network

Marceline the Vampire Queen is a main character in the American animated television series Adventure Time created by Pendleton Ward. She is voiced by Olivia Olson in most appearances, by Ava Acres as a child and by Cloris Leachman as an old woman. Marceline is a fun-loving 1,000-year-old trickster vampire queen. The name Marceline is based on the middle name of a childhood friend of Ward's, Marie. The artistic design for Marceline was created by Ward, with small changes and additions added by Phil Rynda, former lead character designer and prop designer for Adventure Time. Unlike a traditional vampire, Marceline does not need to drink blood to survive; rather, she eats the color red. Marceline is a musician who plays an electric bass that she made from her family's heirloom battle-axe.

The character makes her debut in the first season episode "Evicted!" and functions as an antagonist, forcing Finn and Jake from their home. However, as the series progresses, Marceline becomes a close friend to Finn and Jake. Information regarding her early life is few and far between; however, her demon-father Hunson Abadeer (voiced by Olivia's real-life father, Martin Olson) has appeared in several episodes.

Marceline has been critically acclaimed and is popular with fans of Adventure Time. Ward himself has stated that Marceline is his favorite character in the series because he does not know everything about her history and backstory, which he noted adds a mysterious element to her character. Despite the positivity, the episode "What Was Missing" became somewhat controversial because of an allegedly implied past relationship between Princess Bubblegum and Marceline.

Marceline is one of the main characters in Adventure Time. Ward purposely set out to make Marceline's character complex, as he explained that "with the female characters it’s easy to either write them as clichés or write them as the extreme opposite of those clichés […] I just try to make them have faults and strengths just like Finn and Jake have."

Marceline The Vampire Queen has not been a contender in any CBUB matches.