Mila looks good. A little bit like one of those butch-style lesbians, but good.
I personally love unlockables. Its an incentive to keep playing, just like %100 on any other game ever. Titles are the same. They aren't reasons people buy them, but they sure do keep you entertained, and while youre entertained, you'll be more likely to buy DLC. Which, btw, on-disk is a no no. DLC should large packs of seriously developed brand new material like with as much as work put in as whole games (a la shivering isles, debatebly the best piece of DLC every released ever). For a fighting game, I guess that would be new modes, stages, and characters all bundled nicely for 20-30 dollars.