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Marceline the Vampire Queen is a character in the American animated television series Adventure Time created byPendleton 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 Jakefrom their home. However, as the series progresses, Marceline becomes a close friend to Finn and Jake. Information regarding her early life remains sparse as of 2015; however, her demon-father Hunson Abadeer (voiced by Olivia's real-life father, Martin Olson) has appeared in several episodes. In addition, Marceline was the focus of a miniseries entitled Stakes, which aired during the show's seventh season.