Anyway, judging from his career, it looks like he may be a bit of an otaku: almost all of his MMA fighting has been in Japan, where he has also managed to score a few movie roles. One of them was in the 2005 Devilman flick, and another in You're Under Arrest!'s 2003 live-action drama.
He's adding a new piece of otaku cred to his resume, however: on New Years Eve, he'll be fighting Mantaro, the main character from Kinnikuman Nisei. How will this be accomplished? Well, it'll really be a guy in a Mantaro outfit. But come on, tell me that's not kind of cool.
Seriously, if only we had this kind of thing in the US. Wouldn't you love to see, say, Tiger Woods take on Eric Cartman or something?