—Unlike his exterior appearance, his interior appearance is mangled and, to the sane mind, depressing and downright terrifying. Throughout the seventeen long years of his life, Aoba has been through a lot, and that lot has changed him in way more negative ways than positive. To mention the most notable, he's terribly misanthropic. Every thought he thinks on the subject of humans is negative and degrading. In his mind, every human fits the same category, and every human that doesn't is disregarded and shoved away to keep his perfect, pessimistic view of the world.
—Not only is he misanthropic, but he's extremely cunning, manipulative, and violent. Quit often, he's referred to as an Izaya reincarnate: all the mind games, the seemingly harmless innocence, the way his malice tended to spike at all of the oddest moments. He's always seen with a cheery smile and a peppy tone, but it's all a part of a nasty trick to get on everyone's good side with witty words and pretty poetry, only to tear them all down from the inside. He wants to see everyone suffer, the way he has in the past. When it comes to violence, he tends to pick on those smaller than (and, on occasion, bigger than him) him, even going as far as to start up fights that eventually escalate to bloodshed.
—Despite all of this, however, Aoba is truly lonely. He plays everything off with a thick veil of apathy and animosity, but all he really wants is someone who would stay. He would never, ever, in a million years, admit to that, but it's the blatant truth. Purposefully, he inhibits himself from this one wish, only making his mental deterioration speed its self-destructive decaying. He's going to be the death of himself, and he refuses to change his ways to stop it.