Although she did not appear in the series pilot, the groundwork for her design and character was present in the series pitch book, penned by series creator Pendleton Ward. Marceline is one of the major characters in Adventure Time. Marceline is voiced by Olivia Olson (2015) Marceline's relationship with Princess Bubblegum created controversy when the episodes ' What Was Missing' and ' Sky Witch' implied that they had been in a relationship-a relationship that was confirmed in the series finale ' Come Along with Me.' The relationship was also the subject of the second episode of Adventure Time: Distant Lands, 'Obsidian,' which was nominated for a GLAAD Media Award for Outstanding Kids and Family Programming. Early in the show's history, Ward himself stated that Marceline was his favorite character because he did not know everything about her history and backstory, which he felt added a mysterious element to her character. The character was also the focus of the seventh season miniseries Stakes (2015). Marceline has been critically acclaimed and is popular with the Adventure Time fandom. 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. 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).

However, as the series progresses, Marceline becomes a close friend to the two. Marceline makes her debut in the first-season episode ' Evicted!' in which she forces Finn and Jake from their home.

Ward created the artistic design for Marceline, with small changes and additions added by Phil Rynda, the former lead character and prop designer for Adventure Time. Marceline is a fun-loving 1,000-year-old vampire queen, as well as a musician who plays an electric bass that she made from her family's heirloom battle-ax. She is voiced by Olivia Olson in most appearances, by Ava Acres as a child, and by Cloris Leachman as an older woman.

Marceline the Vampire Queen is a fictional character in the American animated Cartoon Network television series Adventure Time, created by Pendleton Ward.

Marceline as she appears in the show's intro

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