Violence: There is blood, since it's about vampires. There is fantasy violence and action, though most of it is bloodless, with a few exceptions (traumatic flashbacks). It's really just those scenes and the bloodsucking to worry about. I will say the violence is enough to warrant a PG-13 rating. I'll also mention frightening images here, because there are quite a few of those.(Naenia freaks me out.)

Sex and Nudity: I can't think of anything that's outright dirty, aside from an instance where Vanitas mentions Jeanne's chest size and the opening theme features a brief shot of the top of Noe's back while he's taking a shower. (The shower thing is supposed to represent a part of a routine and not be sexual in any way.) The reason I think it warrants a 3 is the somewhat sexual undertones of bloodsucking (the way Vanitas talked about a certain character sucking his blood kind of made me uncomfortable on occasion.) I'll also mention non-consensual kissing.

Theological Themes: Well, we have a church organized vampire hunting unit. (They're obviously antagonists, since the majority of our protagonists are vampires, though it seems as though they only hunt vampires who harm humans or invade their base.) Vanitas insults one of the member's religious beliefs. I don't know how much of that was out of disdain for Christianity or his hatred of the specific person. Spoiler: That character does end up joining the side of Vanitas and Noe, while remaining a Christian, though he is accused of having more faith in himself as a servant of God than faith in God himself. This criticism comes from someone who opposes his interest in vampires and the idea that vampires and humans are similar.I personally think the idea of the Chasseurs was stemmed from the legend of vampires being repelled by crosses, but use your judgement when it comes to this series. I can see lots of people having problems in this department. Also there is a parallel dimension where evil beings curse vampires and turn them into bloodsucking monsters. The Book of Vanitas is the only thing that can cure them.

Problematic Themes: One use of the h-word as a swear. The religious characters use 'hell's bells' maybe three times in total. Anyways, swearing isn't really a problem in this series. I don't recall any substances either.

Overall: I really liked it. I would have given it a 10. The story is interesting. There's a lot of drama and a bit of political intrigue. It's interesting since it raises the idea of what would happen if some rando, who is connected to the ancestral enemy of a group of people, reveals he has life-changing information that can help them. Obviously some people are more open than others. Ethical dilemmas arise from time to time. The characters are very colorful and each has their own backstory and motives (though it's unfinished, so not all of them got screen time.) Vanitas is mysterious, morally ambiguous, and kind of creepy from time to time. He's an utter trash goblin, but I'm fascinated by him anyway.(His advances toward Jeanne were not amusing.) Noe balances him out with his empathy and innocence. I think he might end up being a parallel to Vanitas in some way. The art is gorgeous, and I adore the ending theme. It weirdly reminds me of Fullmetal Alchemist, with a dash of Toilet Bound Hanako-kun. It does have some great comedy. I'll say older teens and up for violence, the bloodsucking, and sexual harassment, as well as some creepy imagery.