They really do look like they're different races. Zoro looks sorta Japanese and it wouldn't be strange if Robin was considered Russian if you're looking at this picture. Hell, even Luffy is considered Brazilian and he has brown eyes . It looks... More realistic than anything I've seen so far while keeping it's manga style.
Let's see, I think I remember this... First you defeat Usopp, use his weapon on Chopper, and then use Chopper's weapon on Brook, and Brook's on Franky. You then use the armor upgrade you find in Franky's stage to help you out on Robin's. Nami is weak to Robin's weapon. Then Sanji and then Zoro. Beat the tower stages and then Wily, and you're done. All in all my favorite Mega Man game.