Thumper is a hot-headed, almost always angry rabbit from a planet inhabited by anthropomorphic people like him. He travels on a spaceship together with his crew and is a main technician/mechanic there, keeping the spaceship at it's best condition. He's fast and agile, and because of his height, he is able to fit into small spaces.

He lost his right leg in an unfortunate accident, as it got crushed under a falling, heavy piece of metal while he was working. For the first few months he wore a regular prosthetic leg, but seeing how limited it made his movement, he decided to construct himself a proper mechanical leg to be able to get back to full health. He is responsible for the whole maintenance of his prosthetic and doesn't let anyone touch it.

While working, Thumper is precise and patient. This is the only activity that actually helps him calm down and keeps him focused. He hates to be disturbed while working, though, sometimes he lets his friend Terra watch. He barely shows affection to anyone, but deep down is thankful that some people are able to put up with him.

He loves vegetables, his favourite is cauliflower. He absolutely despises meat, but enjoys a barbecue sauce. While working, he usually listens to music or interdimensional podcasts/radio from all over the universe. 

Because of the fact that he often had to negotiate and find replacement parts for the spaceship and his own creations, he learned a few other galactic languages to make the process go smoother for both sides.