Pendleton Ward Creator Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Cole Sanchez Guest Voice Niki Yang BMO Guest Voice Max Charles Jay Guest Voice Jonathan Frakes Adult Finn Guest Voice Shyloh Oostwald Bonnie, Blanket Child Guest Voice Mandy Siegfried Roselinen, Adult Bonnie Guest Voice Dee Bradley Baker Quilton, Adult Jay Guest Voice Fred Seibert Executive Producer Kelly Crews Producer David O'Reilly Writer Tom Herpich Writer Steve Wolfhard Writer