The MC is a ticking time bomb. He's pretending to be a typical Japanese MC and isn't even aware that he's something else entirely. However, more of his true nature is being revealed as time goes by. Events drive sudden character developments by the MC, leaving nearby characters unsettled and caught off guard by his sudden growth and insight.
Although it took a long time to get there, at a certain point the MC started to make me pleasantly uncomfortable. Though highly unlikely, this MC gives me the feeling that depending on what stimulates his development and whether or not he's pushed into a corner, any character who isn't his direct subordinate could be reduced to a bloody mist with little to no provocation.
It's like a psychopath with more power than god living the life of a common person because that's the only way he's ever lived (in Japan,) and the moment he realizes that he's a psychopath, the world will end.