death note is a classic everyones should see
there's also naruto, bleach, one piece ( no fairy tail, it suck ) who are also verry popular
dragon ball should be also on your priority list
If you like more adult shows i suggest berserk, darker than black, elfen lied, code geass, Phantom: Requiem for the Phantom, Great Teacher Onizuka
if you liked afro samurai you might watch samurai champloo