[1] He typically enters the arena in an outlandish fashion, such as in his UFC debut, where he sported a bathrobe and devil mask while clutching a Snoopy stuffed animal.
On December 14, 2002, Mishima challenged Takanori Gomi for the Shooto welterweight (154 lb) championship, but lost by technical knockout due to punches.
Mishima had four fights in PRIDE, winning over Charles Bennett and Marcus Aurélio and losing to Yves Edwards and Ralph Gracie.
His final appearance with the company was in the reserve fight of PRIDE Bushido 9 on September 25, 2005, where he defeated fellow alternate Charles Bennett with an ankle lock.
Joe Stevenson, the winner of The Ultimate Fighter 2 who had just moved down to the lightweight division (155 lb), defeated Mishima in the first round by a guillotine choke.