Note: This is a review of the Funimation English dub version of Tokyo Ravens.

Age Appropriateness: I rated this title 13+, but that is with a lot of caution. Please see below for details.

Violence / Gore:
There are many fighting scenes in Tokyo Ravens, the bulk of which are fights against monster-type creatures. Generally, there was not a lot of blood shown during these fight scenes.
A girl is impaled (no blood shown but it’s a very serious moment/injury).
A monster’s head is taken off, and the monster quickly disintegrates (no blood).
One girl speaks very threateningly to those around her.
A guy almost chokes a girl to death.
A guy is slashed with a sword and there is a huge blood splatter that follows. The guy collapses and there is blood all over the ground.

Nudity / Sexual Content:
I did not expect Tokyo Ravens to have the amount of content that it did within this area…
A girl threatens to cut off a part of a guy’s anatomy…
A fox-girl shows her butt to a male character. She wasn’t meaning to be sexual but it causes an awkward scene. Most of her rear-end is covered by her tail. This character is on the younger side, and some people accuse the male of being a pervert with her.
Some characters have very short skirts. So short that sometimes you can see flashes of their rears.
A character unbuttons her shirt and opens it Spoiler: but it turns out it was just a familiar meant to convince the school she was a guy… so nothing but a male chest is actually shown. During this scene, some students think that the female character (who they think is a male) is being undressed by a male character. They are very giggly about it.
This guy and girl later accidentally wander into an area of town full of “love hotels.” The giggling students above state that they think the two are going to “go all the way.” The conversations that follow are similar in nature, though a little more detailed. The girl and guy retreat into one of the love hotels to hide. They turn on the TV and (though the TV screen is not shown) there are some awkward noises coming from it. The two quickly turn the TV back off.
There is some accidental boob-grabbing when a character gets on a motorcycle.
A girl basically has all of her clothes ripped off during a fight but somehow the most important parts are covered in tatters (but barely).
A girl has an out-of-body experience in which she is unclothed. Sparkles hide the important areas.
A transformation scene shows some rear end.

Potentially problematic theological themes:
The plot of Tokyo Ravens revolves around a school that teaches its students to use spells to fight spirits/demons/people. There are shamans, spirits, exorcisms, etc. all throughout the show.
A girl seals a guy as a familiar by drawing a star on his cheek with her blood.
Quote: “May he traverse the heavens to move the hand of the creator.”
A character offers himself up to the “god of the afterlife.” A character calls on gods while casting a spell.
“Buddhist magic” is mentioned about some of the spells being used.
Some characters try to bring the dead back to life. This is an over-riding theme of the anime.

Other potentially problematic themes:
I counted about 7 mild swears in total through the series. They used a handful of different ones.
An underage boy drinks a can of beer and offers some to his friend.

*
Tokyo Ravens just did not hit the mark for me. From the get-go I had many questions that went unanswered. The sexual content was too much for me, too. Way too often, way unnecessary, and not funny.
The art shifted back and forth and I decided that the inclusion of the CG-style was just weird. Hokuto the dragon, however, was gorgeous. The way she moved and flew through the air reminded me of Haku in Spirited Away. Lovely.
As a whole, though, I found this series forgettable. Spoiler: Not to mention that I found the ending far too open-ended and un-resolving. In the end, when it comes to this sort of plot line, I prefer Blue Exorcist by a long mile.