BMO

BMO (phonetically spelled Beemo) is Fionna and Cake's living video game console, portable electrical outlet, music player, roommate, camera, alarm clock, toaster, flashlight, strobe light, skateboarder, friend, soccer player, video editor, and video player. It makes its appearance in the title scene of the Theme Song of every episode of Adventure Time, just as Fionna and Cake pound their fists together. BMO is characterized as a loyal, trusting, and helpful friend who is protective of Fionna and Cake.