Talk:Karao Saeki/@comment-217.212.214.57-20160417121116/@comment-10733658-20160417121742

Actually, his diary entry from Volume 4 does indicate that he has some sort of very serious Mental Illness or Neurological issue.

It doesn't seem like Autism to me, though. While he is socially awkward, that awkwardness seems to stem from what he describes as an inability to view others as anything but "flesh bags" or "meat puppets". He is incapable of seeing people as....well...people.

He also seems incapable of accepting any sort of rejection or disappointment, resorting to violence and tantrums if confronted by something he doesn't like or want. He also mentions a previous lover that left him in the past, and acted as the trigger for his psychotic behaviors.

I'm kind of hesitant to label any particular disorder, but it sounds a little like Anti-social Personality Disorder. It's a common disorder found in Serial Killers and other offenders lacking in Empathy.