Marceline is a fictional character from the animated television series Adventure Time. She is a vampire queen known for her love of music and her playful yet complex personality. Marceline has a unique ability to manipulate shadows and can float, which adds to her mystical charm. In the series, she shares a close friendship with Finn and Jake, the main characters. Marceline's backstory reveals her struggles with loneliness and her relationships, particularly with her father, Hunson Abadeer. Her character often explores themes of love, loss, and identity through her songs and adventures.