I am a big fan of a number of Japanese light/web novels. If I had to say who my biggest inspiration was, it would absolutely be Mayamura (The writer of Overlord). The whole concept of the Evil overarching OP MC, the idea of world domination and writing from the perspective of demented characters who want nothing more than to see the world around them burn, those sorts of things. I was also heavily inspired by Fuse, the writer of "That time I was reincarnated as a slime", especially regarding the kingdom building aspects and the overwhelming ability system, as well as the whole "Monsters vs. Humans" thing. And finally, I was also heavily influenced by Tappei Nagatsuki, the writer of Re:Zero, both in terms of some of the abilities within my novel as well as the whole concept of putting characters through extreme psychological and physical suffering in order to promote their growth.
https://www.webnovel.com/book/undetermined_15269556805685205