Goenitz was annoying, dern right. I had more trouble with Violent Ken than Riot Iori though.

Jinpachi is cheap, but each character seems to have a move/string that will be effective against him repeatedly. For Lee. his Down+Kick, Kick, Kick etc beats Jinpachi in a flash. Raven's flying knee, poking stab and 3 kick combo work well too. If you can find the move that works well against Jinpachi and abuse it, he isn't that hard at all. If you can sidestep the fireballs on reflex (I can't, though I did do it magically once) it'd be even easier. If you're close enough to him when he starts the fireball--if he doesn't dash backwards--you can hit him out of it for Counter damage.

Alpha 152 (I think that's the name) from DOA4 was harder for me than Tengu and Genra (DOA3). She's almost as cheap as Jinpachi, and doesn't have a lot of openings. She's not unbeatable though, but I think I had the hardest time with her out of all other games so far.