Marceline, the Vampire Queen is a main character of Cartoon Network's "Adventure Time," a show that is much more for teens and adults than children. Marceline is an ancient rocker-chick vampire who sings and plays guitar with her band The Scream Queens. Her guitar is a red battle-ax reminiscent of Buffy's in Season Seven. She doesn't drink blood, but drains the color red out of objects like apples and strawberries - quite fitting for a 2-dimensional ink-drawn character.
From LA Times Hero Complex
The Emmy-nominated cartoon is one of the Cartoon Network‘s most popular shows, consistently ranking No. 1 in its time slot among boys 2 to 14, according to Nielsen. But the show has developed its most devoted following among adults, who appreciate the dark humor beneath the inviting rainbow storybook exterior. It’s rare for an animated series to be equally informed by the likes of “Meatballs” and “An American Werewolf in London” as by fairy tales.
As whimsical as the “Adventure Time” world may appear, the series is dappled with hints that the Land of Ooo is, in fact, a post-apocalyptic version of Earth — a dark origin story for a colorful world. After all, Finn is the only human he knows, and although he is unfailingly positive, that knowledge comes with a profound loneliness."
. . . The Land of Ooo is home to a host of zany characters, including Marceline, an immortal vampire queen who feasts on the color red and turned her heirloom battle ax into a bass guitar;
From ComicVine
Wild and fearless, Marceline the Vampire Queen's origin is somewhat vague and ambiguous. She is over a thousand years old, and as her title suggests a vampire queen. She is also half demon, as confirmed by her alternate Farm World self.
. . . She is said to be a survivor of the great Mushroom War, a near cataclysmic event which dramatically altered the world at the time. Her relationship with her father Hunson Abadeer "King of the Nightsphere" was also strained after an incident in the past where he partook in eating her fries, and was further exacerbated when he stole her axe bass guitar. Although Marceline will often try to convey that she is evil and dark, it is much more of a pretense and act, unlike her actual father who is actually the lord of all evil.
. . . Despite her wild, scary and unpredictable nature, she is friends with Finn and Jake. She also appears to have a complicated love hate relationship with Princess Bubblegum hinting at a deeper and more complicated relationship. She often likes to jam on her custom made battle-axe bass guitar, she sustains herself on shades of the color red, as opposed to blood, and there is said to be no Vampire King, as Marceline is said to have killed him.
