Haiyore! Nyaruko-san

Haiyore! Nyaruko-san:  C

So my first description of this series to my friends is as "The least dignified possible series about the Cthulhu mythos possible" and I still hold to that description.

In short, Nyarlothotep takes a form as an attractive silver-haired girl with an extreme ahoge (idiot hair) who (depending on how you interpret the series) either falls in love with a human boy or decides to screw with said boy in an extraordinarily invasive and creepy way.  But not creepy like Lovecraft creepy, creepy in that 'girl trying to get herself pregnant by you without your consent' sort of way.  Nyarlothotep is interfered with by Cthugha and Hastur (or possibly Hastur's son, it's not well explained), which could either be a good thing or a bad thing.

It's pretty funny, but it's not really good.  The series has a lot of references, to the Call of Cthulhu tabletop game, the Lovecraft mythos and anime of all flavors.  It's a High School Fantasy with all that implies, it just also has a lot of references to the Lovecraft Mythos and some moments of genuinely hilarious comedy.  Being a High School Fantasy isn't actually a bad thing, but it does establish a quality ceiling.  There's only so good one can be, and Haiyore! (which means, about "Creeping!") Nyaruko-san starts strong and trails off, like so many of its type do.

Give it a watch if you want to see a handful of awesome bits of animated Cthulhu mythos and get some laughs out of clever references, wordplay and Lovecraft-based humor, but don't go expecting anything brilliant or moving out of it.