A-ha, build it and they will play. Or rather, build it and they will stop whining for people to zomg put Uzumaki Naruto & Kurosaki Ichigo & Son Goku & bankai & sharingan & kaioken lololol in maps. I can't imagine any decent RPs happening with anime characters, although I'd be able to appreciate anime-style models.
Most of the anime that achieves mainstream popularity in the States is, yes, cheesy voice acting, a perverted scene or four per season, and the good guys winning. Except for Neon Genesis Evangelion, which is just one great big mess. Don't worry if you hurt yourself trying to figure out what's going on by the end of the season. Oh, and Dragon Ball Z is cheesy voice acting, the good guys winning, fiery constipation, and pooping laz0r beams from their hands (the end result of fiery constipation). And hugely-muscled men hitting each other for being bad. Oh, and anything that 4kids gets their filthy hands on immediately becomes for 4-year-olds, so no perverted scenes, but lots and lots of cheesy voice acting.