Origin

Mysterious keyboardist of the music group Marceline and the Scream Queens, Guy seems as mellow and he is dreamy. After holding a concert for Candy Kingdom, he with the rest of the group, will now embark on a tour of the Land of Ooo. Guy is also a Werewolf, or at least he initially explained to Princess Bubblegum that he was, but a few nights later he would reveal to Bubblegum that he is in fact a Were Fish. Guy however  seems quite shy about his altered form. There has been some flirtation between Guy and Princess Bubblegum.   

Creation

Guy is a character from the Adventure Time franchise created by Pendleton Ward. He first appears in the mini series Adventure Time: Marceline Scream Queens #1 written by Meredith Gran released in 2012.  

Powers and Abilities

Guy is a very skilled keyboardist. Initially thought to have been a were wolf Guy has revealed he is in fact a were fish. Perhaps more surprises can be found with someone so mysterious.