Marshall Lee (full name: Marshall Lee the Vampire King), is the gender-swapped version of Marceline, created by the original series designer, Natasha Allegri, who is featured in "Fionna and Cake." In the episode, he is seen attending Prince Gumball's Biennial Gumball Ball. Just like Fionna and others, Marshall Lee is from Ice King's imagination, although Marceline was telling his story in "Bad Little Boy." His skin appears to burn in sunlight in the episode, like most vampires' and Marceline's. He plays a major role in "Bad Little Boy," attempting various ways to trick Fionna into admitting her love for him.