The main cast are all broken. They should all have a screw(or more) loose. Their faults can be many and varied, but it's important that they're all broken.
The Experimental Log of the Crazy Lich is in your reading list, but it doesn't seem like you've started reading it yet. So I'll recommend that.
Your and my Asylum, but there they have more than one screw loose and there is rather descriptive torture and death, but the two main characters are broken in various ways.
Utsuro no Hako to Zero no Maria. The whole cast have loose screws and are obsessed with one or more things.
I've downloaded the epub, and I'm still at the beginning. I prefer to read offline for the most part. Only the really good ones do I want to read online so I can see the comments of others.
Tower of Karma the mc is broken, his two friends has somewhat loose screw, but not as much as him. a pity it has't been updated for 5 month (╥﹏╥) Spoiler: He ate his sister's corpse so that she will 'remain within' him, and to continue fueling his thirst for vengeance. later, he shows sign of D.I.D
Dungeon Defense definitely broken except for the side characters of the princess. Something something general his the only one who isnt broken.
Because almost everyone knows I literally wank to Dantalian? It should be Res ispa Loquitur(The thing speaks for itself), that I read Dungeon Defense. Even my signature, and my title speak to my worship of Dantalian.