Believe it or not, him being "retarded" is actually beneficial. I.E. getting trouble, giving 0 f*cks, hilarious moments. etc. But I respect your opinion, I was just curious.
Elfen Lied
D-Gray man
Rave master
Magi
Death Note
Fate Zero
Stein;gate
mushishi
Monster
Baccano
Hellsing Ultimate
Black Lagoon
Psycho-Pass
K(K-Project)
Kill la kill
Another
Code:Breaker
Mirai Nikki
Akame ga giru(Anime Started from july 7th)