According to the ESRB, this game contains: Blood and Gore, Fantasy Violence
Parents don't have a lot to worry about. Although the game's graphics are sharp and feature smooth animation, I wouldn't really call it "gory" although there is some blood (mostly red splooshes here and there). Basically, the violence consists of the main character attacking creepy monsters, spirits, and other things that go bump in the night. The symbols that must be drawn before finishing off a boss monster look vaguely occult-ish, but in my opinion this is a very minor detail that has no significant relevance to the actual game. There is no questionable language and no sexual situations.
Action gamers will be treated to one of the best purchases for the Nintendo DS. It's not revolutionary, but it's completely solid and well worth the price of purchase especially when you take into account the optional Julius mode that opens up after beating the game. If you're tired of Castlevania you might want to skip it, but otherwise this is a must-buy.
Deaf and Hard of Hearing gamers will have no problems here. The game features full text for all dialogue, and there are no significant auditory cues. Personally, I played more than half the game with the sound completely off and had no issues whatsoever.