Read this one. xD http://www.mangago.me/read-manga/onepunch_man/
Hellsing. Alucard is really strong, and possible the best anti-hero out there.
Berserk, both main character and antagonist are neither good nor bad. and it has character with the i'm really weak and scared but i'll fight for my friends mentality. But it's not like your average manga, it's very gorey and alot of what happens or what happened in the characters past is very rough. Idk if you don't mind those things or not.
They are all very good manga, however I have already read them all. But thanks anyway.
Can anybody give me a good anti-hero manga where the main character is really strong or a manga where the main character are not all " I beleve that there are no truly evil people/ I am really weak and scared but I will fight for my friends!"