Black Butler is a favorite manga of mine, I personally think it's better than the anime, while the anime is good, it's just doesn't compare to the manga.
Let's see....
Death Note
Black Butler. (Kuroshitsuji)
Fairy Tale
It's not my fault that I'm not popular!
Shingeki no kyojin ( Attack on titan )
Sket Dance!
And Hellsing.
Mine are:
Skep Beat
Vampire Knight
Kamisama Hajimemashita
The One
Black Bird
Leopard hakusho
1/2 prince
Father Complex
The Summit
Zetsuai
Wild Rose
Calling
Oniichan Control
Super Lovers
Switch girl
Koi nante shinai
Forbidden kiss
Fallen Angels
And much more! XD
Naruto
Bleach
Detective Conan
Doraemon
Mint-na Bokura
SGC!
XX me!
Koya's Love
Hell Girl
Prince and Hero
Kami Kami Kaeshi
Maid Sama!
Arisa
Animal Official
Kaitaikun!
Rockin' Heaven
And many more...