Dark animes like soul eater

Tokyo Ghoul ,Monster,Akame Ga Kill,death note those are the dark animes that came to my mind

Others have also recommended it but I would definitely suggest Psycho Pass, it's got a lot of good themes going on and some good action!

Ajin is good but I've only ever read it so I'm not sure how well it translates to the show itself.

If you want a shorter anime arc with some more fantasy (?) themes I would super recommend Black Butler's Book of Circus arc!

Re:Zero is pretty dark. Black Bullet also at some points. Both have elements of tragedy in them.

I tried watching goblin slayer but to wack for me. Super fucked up.