Marshall Lee is the gender-swapped version of Marceline. Marshall Lee presumably has the same abilities as Marceline, as 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. Marshall Lee needs to have a more edgy, laidback tone of voice. I would prefer for him to sound like the character in the show, but I am very open to variations with this character considering his personality. I think playing around with interpretations of his voice could be interesting, so feel free to change it up. Marshall does sing in this episode, so I marked him as a singer. However, if your voice fits the part very well we can work out a more "talk-sing" style.