I think I'll go with Boba Fett, since he's a Bounty Hunter and stuff as the new Western Villain.

Eastern hero is that human Gojira.

Eastern Villain I'm not sure who it may be yet... (maybe a Fairy Tail, Soul Eater, or Kill La Kill opponent.. or a personified Monster Hunter monster of my choice...)

Western Hero can be like Iron Man or Powergirl.