Horror anime

Mononoke (my favorite)
Hellsing (Ultimate / The Dawn)
The Promised Neverland
Ajin
Paprika
Perfect Blue
Jigoku Shoujo
Corpse Party
Higurashi no Naku Koro ni
Tokyo Ghoul
Pupa
Vampire Hunter D (another favorite)
Junji Ito Collection
Blood C
Ayakashi Japanese Classic Horror (not very good but its still something to watch thats lesser known) 
Petshop of Horrors
Blade
Yami Shibai
Tomie