Hobbes

From the Un-Mario Wiki, the Mario no-ledge-base.

Hobbes is a tiger from the comic strip Calvin and Hobbes which Bill Watterson abandoned a long time ago. People see him as a stuffed animal, but Calvin sees him as real tiger who can talk. He appears in Mario Mart with Calvi in their Cardboard Box. Calvin said Mario was a total rip-offer because of all the money they had to spend never got back, but Hobbes doesn't take such a big interest in this, as he said to Calvin he was a fool to agree to be involved in the game, but has still agreed on a revenge against Nintendo and Mario with Calvin.