"Awaken, and lend me your strength!"
Sora is someone who you can read in one look. Sort of. On the surface he lays out a persona of a cheery, happy-go-lucky, 'make friends with everyone' sort of person. That some (most) would say is annoying. He feels the need to surround himself with friends, no matter how fake. He tends to keep this up well, rarely showing his true self to anyone who hasn't worked their way deep into his life. So naturally a lot of his "friends" have never seen this side to him. The side he keeps hidden, is something quite different. It's a sadder, near-pitiable affair. The most obvious thing is a fear of feeling weak, and an obsession with getting stronger; Although he tends to disguise this with competitiveness. Another, less obvious sign is that he gets both angry and sad at the same time, making him seem like his just being twisted, but it's more frustration. Or fear.
He sees the ability that he was given as both a gift and a penance for his past. And hopes that he is strong enough to embrace it.
Sora has had a fairly okay life. He found that his personally drew people towards him, and that he often found himself being quite popular. Not so much that he was exempt from bullying, which eventually lead to the start of his need/want/obsession with strength. Someone who he considered to be quite a close friend was being bullied, much more severely than himself. The friend endured beating, after insult, after insult, after beating. Seeking solace in Sora, the boy begged for help with it. Sora, however, felt the very...human fear for his own well-being, and attempted to turn a blind-eye to it, telling the boy (and trying to convince himself) that they would grow bored with time, that it would eventually stop. But it never did. And Sora done nothing to help, even while the person he used to know drained away, leaving a battered, broken shell in his place.
The boy's parents would eventually find him hanging by his school tie in his room, with a note that only asked "Why?". This probably was what finally split Sora's personality in two, the unanswered questions. 'Why did the bullies pick him?' 'Why didn't his "friend" help him?', and worse of all, "What if Sora had stood up for him?"
Having moved into his own house, starting college in a new area, Sora has only had the silence to echo the questions back to him...