Marshall Lee

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.

Abilities
Marshall Lee presumably has the same abilities as Marceline, since he was first seen floating. Some official artwork shows him eating the color red, just like Marceline, and sucks the pink from creme puff filling, in "Bad Little Boy" he mentions "Drinking the red from your heart in one sitting." He can also sing and plays a guitar. He can turn into a bat form, like Marceline, except he keeps his hair. Like Marceline, he can also raise the dead. He also appears to have the same rapid healing that Marceline has, as when the sun started to burn him, the burn vanished as soon as Cake blocked it from touching him.

Appearance
Marshall Lee has a slim body, an average height, black hair, and light gray skin. He has a matching permanent bite mark like Marceline's. In "Fionna and Cake" and "Bad Little Boy," he is seen wearing a red plaid shirt with gray stripes, dark blue jeans, and brownish-red and white sneakers. Like Marceline, his physical appearance is that of a typical late teenager or a young adult.

Personality
Marshall Lee describes himself as a villain. He is rowdy, endangering others with his violent, 'friendly' rough-housing. He appears to have an interest in music like Marceline, as he's shown to rap and carry around and play an electric guitar, opposed to Marceline's bass guitar. He greeted Fionna with the sign of the horns, a very popular hand sign amongst heavy metal and rock fans. He also displays Marceline's love to mess with people with elaborate jokes, but goes to a further extent than his female counterpart and feels remorse quicker. Since Marceline is telling his story at this point, this might suggest the way she thinks of herself; as a villain, although Marshall Lee is arguably the more evil of the two. This also might suggest that Marceline wishes she could express remorse better; she rarely apologizes to anyone.

Fionna
Marshall Lee is first seen interacting with Fionna in "Bad Little Boy." Just like in Finn and Marceline's relationship, Marshall likes to mess with Fionna's head. He is seen on the roof playing his guitar saying, "Hey, Fionna," to which Fionna smiles and says his name in a happy way. He soon asks her to go to Lumpy Space Prince's Party, she is uncertain of whether she should go. Marshall just takes her saying he knows she will come anyway. There, he is seen doing bad things to convince her that he is evil. He even goes as far to fake that he's dying and asking her to admit her love for him. While doing this, Fionna freaks out and tells him that in his last moments he should be serious. She mentions that he likes to flirt with her and thinks its funny. When he reveals that he was only faking, Fionna angrily punches him, then proceeds to do so again, while laughing.

Cake
Marshall often messes with Cake, but they seem to be on good terms. When Marshall Lee appeared to be hurt in the episode Bad Little Boy, Cake used her body to shield him from the sun which had just risen. She was also relieved when he revealed that he wasn't really dying even though he had just kidnapped her moments before.

Prince Gumball
Marshall Lee's relationship with Prince Gumball seems to be similar to Marceline and Princess Bubblegum's rivalry toward each other.

Major appearances

 * "Bad Little Boy"

Minor appearances

 * "Fionna and Cake" (Non-Speaking Cameo)
 * "Mystery Dungeon" (mentioned)

Trivia

 * Rebecca Sugar said that she wanted Marshall Lee to have a few lines in "Fionna and Cake," but they were cut due to time limitations. She wanted him to be voiced by Dante Basco.
 * An alternate character sheet depicts him with green skin, but it was only used in one scene with special lighting conditions.
 * In "Bad Little Boy," his skin is shown to appear green in the sunlight.
 * When Marshall Lee does the "Sign of the Horns" he has five fingers instead of the usual four.
 * He appears to float in the exact opposite position that Marceline does.
 * While rapping to Fionna in the song, "Good Little Girl," Marshall Lee says that he's from the Nightosphere. He later says that he's the son of a demon (also like Marceline) and is the vampire king.
 * Marshall Lee wears the same outfit in both "Fionna and Cake" and "Bad Little Boy," unlike Marceline who usually changes outfits in every episode she appears.
 * Marshall Lee seems to have some sort of a rivalry with Prince Gumball, similar to Marceline having a rivalry with Princess Bubblegum.
 * His hairstyle is different in "Bad Little Boy," than in "Fionna and Cake." It appears down rather than up, however, this could be because he was first seen in the rain, which could have caused his hair to get wet and fall down.
 * He seems to possess the loneliness trait Marceline has, and hides it like she does.
 * His guitar is made from an axe like Marceline's but is a six-stringed non-bass guitar with a blade on only one-side, unlike Marceline's Axe-Bass, which is a 4-string bass guitar and is double-sided.