Are these extreme Hentai or other type mate?
Not Hentai at all - just regular movies. But the guy's got a very perverted mind (like yours and mine
) and some of the scenes are just over the top gory or plain disgusting. To give you an idea, in Ichi the killer, one of the guys fails in his duty of killing someone and so cuts his own tongue out (a part of it) and presents it to the boss, after which he immediately takes a call on his mobile. Visitor Q is probably the worst of the lot, although I haven't seen all of his work. 1 missed call was a horror movie and it was remade in Hollywood last year.
If you like sick, disturbing movies like 'The piano teacher', 'Irreversible', 'Ken Park', 'I spit on your grave' and stuff like that, you'll like Takashi Miike's work. Check this out
http://www.imdb.com/title/tt0290329/