Global Mutation: I Fight an Evil God for Followers

The Darkest of Dark Stories: Don’t Come If You Have Any Limits

No saintly do-gooders, no System, and no moral boundaries. The protagonist should be willing to kill people who have nothing to do with them for their own benefit.

Lovecraftian Horror at Its Most Extreme: Despairing Yet Exhilarating

I desperately need some books about the Cthulhu Mythos. I have already become obsessed with Cthulhu. My lord, bestow upon me some books about you, my lord!

Mad! Mad! Mad! Completely Insane! This Will Seriously Make Your Sanity Meter Drop!

I want someone who's insane! Everything they do and think should be completely illogical, enough to terrify all creation! No awkward, boring dialogue!!! No idiotic behavior! Utterly deranged, killing whoever they want! No emotions! Powerful! Their face, when you see it...

Mutation, Distortion, Cthulhu, the Old Ones, a Dark World

Looking for the Su-Ke-Lu Series, or Something Extremely Chaotic, Obsessive, and a Little Unhinged

Aaaah!

I Want Something Fresh. I’m Tired of Those Predictable, Overused Plots

Aberration, Contamination, Mutation, Transformation: The Protagonist Stops Being Human

Looking for books similar to "The Age of the Great Voyage (A Journey Across the Haunted Sea)". As above.

Lovecraftian!!!

Any recommendations for good, brainy novels with Lovecraftian vibes?

Unusual but Incredibly Sweet

Looking for something like "CEO, Your White Moonlight Is Pregnant with Your Baby!" Something this unhinged, beyond words. The leads are incredibly, incredibly sweet, but the story is also really bizarre.