Any manga with a good, realistic psychopathic character?

I love this. It truly creeped me out. Bastard is great too. http://www.mangago.me/read-manga/kami_no_kodomo/

http://www.mangago.me/read-manga/bastard_hwang_youngchan/

Save Me

This one's good, but you have to figure out who is the psychopath:
http://www.mangago.me/read-manga/interview_with_a_murderer/

For the full on horror/gore: feeding lamb: but be warned it's really gory!

Interview with a Murderer is great.

Oh, and both are Yaoi. Don't know if you are looking for that

I didn't even need to read the manga, the artstyle is creepy enough for me to step back from it..

Lol! I get that!

Thanks friends xx