Two words come to mind: Junji Ito http://en.wikipedia.org/wiki/Junji_Ito
I’ve read Gyo, Amigara Fault, Principal post and Cat Diary. I’ve been meaning to get to Uzumaki and Tomie but seriously this guy is haunting, everytime I think about it… it’s night time ya know… I just. I know it will creep me out! I can’t help but keep reading yet I am literally uncomfortable to terrified. A must to check out if you haven’t yet. The art alone is worth checking out if you don’t care for the stories. Apparently there are some movies as well but I’ve yet even take a peak at those.
This is a must for anyone who has even seen a cat (and much less scary than the others): http://www.mangareader.net/ito-junjis-cat-diary
What about you guys? Like/dislike horror manga? Read anything of Junji’s? Other author suggestions?