Marceline had pale skin, pointed ears, and fangs even before she became a vampire, because her father is a demon I think this is the one single time like ever that it’s okay that a white woman is voicing a black woman because elise is voiced by rebecca sugar who basically shaped marceline’s character with her songs. She is black on her mother's side, genetically speaking, but she never had dark skin.
Adventure time producer adam muto spoke to polygon about the decision to portray marshall lee as a black character and the legacy of marceline the vampire queen. When elise showed up it finally canonised that marceline black as per her human half because elise is black Marceline abadeer, better known as marceline the vampire queen, is a fictional character in the american animated cartoon network television series adventure time and resulting franchise, created by pendleton ward.
What color is marceline skin