Beastman became a beast hunter after a nasty encounter with a gigantic crocodile on the planet White —after surviving the ordeal, he decided that he wanted to protect people from such dangerous creatures. He is actually quite shy, and in order to keep his bashful nature from being discovered he adorned himself in the imposing outfit of a dinosaur. Before long, due to his heroic deeds and growing popularity, he became known as the Beastman. Having dealt with all the beasts on his own planet, he entered the F-ZERO GX Grand Prix for promotional reasons. There, he met Bio Rex for the first time, and knowing the creature was competing, he made a vow to protect the other pilots and crowd from such a dangerous beast.