OH MY GOD I KEEP GETTING THESE SHOUTOUTS AND I MIGHT HAVE A STROKE THEY MAKE ME SO HAPPY!!! :DDDDD
And OFC character reviews are, like, me addiction, SO! Top down…
Generally I don't critique looks, and everything looks gùd to me, so onto the personality page!! Okay, starting off with mannerisms… I'm kind of torn about this section. While all of the things listed are amaze, I feel like they're more ~quirks~ than ~mannerisms.~ This might just be me! Like I said, everything listed is awesome; it just seems like it's in the wrong section. I find it helpful to list physical tics, like nail-biting or toe-tapping, especially if you can find a way to tie the tics into past experiences. The rest is pretty good, overall. Just a quick caution from me: do. A. Crap. Ton. Of. Research. If you're writing a schizophrenic character, you have to be REALLY careful to do it right. Otherwise you'll lose some of his depth. I must say that I especially enjoy the emphasis on his family; reserved unless he can help. Although when you say he is reckless, you say it is to help anyone. I just assumed you meant family/friends, but I would emphasize that–otherwise, like @Celestial-B said, it's a blatant contradiction.
Okay, everything on social looks to be in order, except for one thing: no government? Looking to some of the other things listed, I'm assuming that this is a bit of a run-down planet, but there has to be some semblance of leadership. Gangs, some rich guy, how cares. Also, I find it helpful to rate my characters on a scale of liberal-ness–it helps me understand how they'd react to certain problems.
Background explains quite a bit; great job!! :P One thing that I would do is add more about his little brother. He's been mentioned a lot, and I feel like it would be important to weave him into the backstory a little more deeply.
Overall: definitely a strong character!! A few things need to be smoothed out, but not that much!! Deepen a few connections and I think you've got an awesome main character on your hands!!!
I hope that this helps you!! :DDD (And thank you again for the shoutout!!)