Rocket sees Leo as a little brother and he’s just as childish as the kids he hangs around with. He is nice and friendly, he is trustworthy. He can't talk, so he usually communicates by making the sound of a marimba and shaking his antenna. When he screams, he sounds like a musician insanely playing a vibraphone really fast. He also sounds like someone making noises with the vibraphone's keys when he gets the "Rocket Hiccups". Rocket is a gigantic 4-dimensional toy spaceship made out of red metal