Marceline the Vampire Queen is a character in the American animated Cartoon Network 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 vampire queen. 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 initially functions as a trickster antagonist, forcing Finn and Jake from their home. However, as the series progresses, Marceline becomes a close friend to Finn and Jake. Several backstory episodes have established that she was born to an unnamed human mother (voiced by Rebecca Sugar) and the demon Hunson Abadeer (voiced by Olivia’s real-life father, Martin Olson). Furthermore, when she was a child, the cataclysmic Mushroom War occurred, and soon after she developed a father-daughter-like bond with Simon Petrikov (voiced by Tom Kenny), who would one day turn into the Ice King.
Marceline has been critically acclaimed and is popular with fans of Adventure Time. The character was also the focus of a miniseries entitled Stakes (2015), which aired during the show’s seventh season. Early in the show’s history, 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 episodes “What Was Missing” and “Sky Witch” became somewhat controversial because of an implied past relationship between Princess Bubblegum and Marceline. Fans of the show have labelled the pairing “Bubbline”.