anime suggestions? I have already seen Black Butler, Soul Eater, Hetalia, Attack on Titan, Hellsing...ETC

I can suggest, Trinity Blood, Durarara!!, Cowboy Bebop, Kekkshia, Death Note, & Ghost in the Shell.
I forgot, Code Geass, Blood +, Monster, Paranoia Agent! Picture is from Cowboy Bebop, btw.

one of my favorit short animes is "My Little Monster", its a really cute anime, and has an ova as well. Its mainly about the relationship between a girl named Shizuku Mizutani and a boy named Haru, but there are other characters as well. Sorry if youve already seen it. But there are 13 episodes.

Watch durarara atau tokyo majin!!! :)

I liked malaikat Beats a lot!
I cried in it too haha Dx
I liked almost all the characters,and it has a good plot,you should watch it! It only has about 13 episodes though.

Kids On the Slope
Kaleido bintang
Okami San and Her Seven Companies
Howl's Moving Castle
Spirited Away
Kiki's Deliver Service

Steel malaikat Kurumi

Levi

Kuroko no Basuke, a sports anime about bola basket and various teams. It's good and is ongoing, too.
and
Code Geass, I've just started watching but it's really interesting. About the nation of jepang which got taken over oleh Britannia, a powerful empire. jepang is now known as 'Area 11'. It's about the rebellion and this boy named Lelouch who leads the rebellion with his powers.