Pendleton Ward Creator Jeremy Shada Finn Voice John DiMaggio Jake Voice Hynden Walch Princess Bubblegum Voice Tom Kenny The Ice King Voice Niki Yang BMO, Lady Rainicorn, Shadow Demon Guest Voice Tom Scharpling Jermaine, Shazbaz Guest Voice Jon Wurster Bryce, Booboo Sousa, Ariel Guest Voice Ron Livingston Morty Rogers Guest Voice Kate Micucci Chips, Bunny Mom Guest Voice Riki Lindhome Ice Cream, John Guest Voice Fred Seibert Executive Producer Kelly Crews Producer Brandon Graham Writer Jesse Moynihan Writer Seo Jung Kim Writer Somvilay Xayaphone Writer