Another MC powering up through danger...
But this MC is a real failure, he blames others for his problems, acts like a hindrance in combat, gets his benefactor murdered while mistaking of his actual enemy as his benefactor, stands around watching while the last good person there that knows what's going on blows himself up trying to stop MC from becoming a monster with no care for human life.
But hey this will be from MCs perspective so either MCs murdering people and turning them into puppets will be "totally fine" by everyone MC talks with (lol), or he'll "just happen" to walk in on a lot of girls dying to fill out his harem with puppets that way...
To whitewash MC as much as possible he'll prb consider himself on the heroes side and try to fight with heroes only for the heroes to "oh noes she suddenly died right next to me" or "if I use my ability on her she'll get a power boost!".
And to make MC even more whitewashed, the villains/mosters will somehow become stronger than all the heroes and only MC will be able to turn it around! OH THE DRAMA.
But, maybe, just MAYBE, MC will be on the villain side and heroes are actually super evil? Though in this story that doesn't make sense at all so far.
As for MC being evil? His brain too fucking slow to turn evil. Maybe if the monster power can upgrade his brain a bit.