I have always wanted to draw this crossover. A lot of people got to it before me, but... I had to do it, anyway.
This pic is for Ash. <3
Edit: Since a lot of people are commenting on it.... why WOULDN'T Marceline be the Rosebride? PB is a beloved noble prince(ss), Marceline is ancient, tormented by her past, and has paranormal powers. All this kerfuffle because y'all don't like Marceline in a dress. I THINK SHE'S KYEWT.