[Tyranid5]

Hope this helps

Comedy

30-sai no Hoken Taiiku
R-15
R-15 OVA
Rio: Rainbow Gate!

Action

Sengoku Basara: The Last Party should be moved from fantasy to action, it's not put in a fantasy-based world really. It doesn't fit with the other series that are in the fantasy category, because the only fantasy element is the super-powers that the generals have.

Drama

Uta no Prince should be moved to romance. There really wasn't a ton of drama in it to start with.

Romance

Dragon Crisis!
Freezing
Hoshizora e Kakaru Hashi
Infinite Stratos
Macross Frontier: Sayonara no Tsubasa
Mayo Chiki!
Onii-chan no Koto Nanka Zenzen Suki Janaidakara ne!!
R-15
Uta no Prince-sama: Maji Love 1000%

Mystery

I agree with coffee about yondemasu.

Slice of Life

Ano Hana
The IdolM@ster (more slice of life than drama)
Working'!!

Sports

I really don't think C fits here well. Sure it has a "game", but the series itself isn't like a sports game, the game is more comparable to the God Game in Mirai Nikki. It's more of a mystery or a drama. As in it's more similar to Mawaru Penguindrum or Steins;Gate, not a traditional mystery.

Horror

The Supernatural, Blade, Deadman Wonderland are the closest series to the Horror genre. Supernatural is pretty gruesome, but they aren't your typical Elfen Lied or Shiki that you would associate with the genre usually.

Ecchi

Itsuka Tenma no Kuro Usagi
Itsuka Tenma no Kuro Usagi OVA
Onii-chan no Koto Nanka Zenzen Suki Janaidakara ne!!