"Like" is probably not the right word for what I'm about to say, but if I would have to pick something it'd be how delusional he is, how not in his right mind he seems to be, it's interesting to speculate how he got to that point and where it will end up leading him. His goal to erase the sin of ability users becomes more intriguing the more the events of the series unfold and the more you learn about the other characters, which makes his goal seem further misguided. I think it's the idea of this infallible person who is actually very flawed deep down is what I find most intriguing