midori's denial of his humanity isn't simply limited to physical dimensions, advantage in the game, or even symbolic meaning. it's what makes him so difficult to analyze. any time he gets even remotely close to revealing any sort of information about himself, he immediately covers it up. any time he appears even a little vulnerable, even a little human, he immediately backs it up with something that makes you doubt the momentary sympathy you had in him. it's difficult to tell whether his actions are because he has severe mental and emotional scars, or because he just is that way. his repeated and emphasized dehumanization of himself makes you second guess yourself, which means he becomes harder to understand. it's quite meta, because this must be what shin felt. you think you can understand him, an opening appears, only to instantly disappear because he simply wont allow himself to exist, evident from shin's dialog in his flashback. is he a sympathetic character? or is he just really, truly evil, plain and simple? it's near impossible to know. then you start to withdraw. and that's exactly how he keeps people at arm's length.