According to ESRB, this game contains: Animated Violence
Parents dont have to worry about blood and gore in this game as there is little of both here. However, what could raise an eyebrow or two is the some of the characters. One of the female characters is, shall we say, decked out in 'revealing' clothing and what she is wearing is barely covering her as is. There is also a character in the game who is really the notorious Jack the Ripper. Playing him through to the end leads to a pretty troubling ending. It's not entirely easy to categorize who will like this game.
If you're any kind of fighting game fan, I think youd like a fighting game as good as Power Stone. Those nursed on the likes of Tekken and Soul Calibur will likely balk at the free-roaming gameplay and lack of traditional combos. Anyone whos tried their hand at Super Smash Bros. has a pretty good idea of what to expect from Power Stone.