Dead or Alive Xtreme 2, Rumble Roses XX and Onechanbara: Bikini Samurai Squad. Hey, you asked for exclusive, interesting japanese games 
I've played a bit of Tales of Vesperia and it seems good.
Avoid Lost Odyssey, specially if you hate slow battle systems.
Gears of War games have local split-screen co-op (since you mentioned it when talking about Halo).
Somehow Deathsmiles (Cave) was released in the west.







