Please recommend a novel where the MC acts insanely or just extremely far from normal, without the MC even noticing his/her own abnormalities. Good example would be MC from "My House of Horrors" Only restriction is that it must not be yaoi
I'm not quite sure how ignorant MCs are to their insanity, but they are clearly insane: To Be a Power in the Shadows Dungeon Defense Summoned Slaughterer
Just to be clear, I suspect that this story is the exact opposite of what you're actually asking for, but I feel it fits the stated criteria. I'm the Evil Lord of an Intergalactic Empire has a MC who, after being walked over for being a good guy on Earth, wants to be an Evil Lord, but, due to his sensibilities being the exact opposite of the natives, becomes one of the best Lords in the Empire. For example, recently (in what's translated) he was bragging about how his Noble Title put him into an authoritative class effortlessly due to being a Noble, thinking this would upset the Commoner's who had to struggle to get into the same class. Everyone else, however, interpreted his bragging as a complaint, meaning that the Commoner's like him even more, while the Nobles were offended that he dare even suggest that a Noble Family's Benefits wouldn't simply be a natural thing to occur. Basically, this MC regularly thinks he's acting in a way that's selfish and obnoxious, but, due to how overwhelmingly bad all the other Noble Houses are, his reputation (without his knowing) just keeps improving. He never seems to notice that his reputation is as good as it is.