@Kaelan: Actually, Castlevania's art style depends on the game. The newest game, Lords of Shadow, (and it's upcoming sequels) are very heavily "western" in style. Portrait of Ruin, and Dawn of Sorrow, are quite "eastern" looking quite anime-ish.
Several of the games had art by Ayami Kojima, (Symphony of the Night, Harmony of Dissonance, Aria of Sorrow, etc.) Not sure what to call that style (besides beautiful!)
Well, the sprites themselves, not sure...they have more realistic proportions than your average 2D action platformer, but it's done in a "Japanese way" if that makes any sense...
Jawnsunn: Maybe RATEDRKOFRANKLIN was saying western can be childish because of western cartoons, most of which look really strange and "childish" if you wanna call it that. Like, most American "comedy" cartoons look absolutely awful.