First things first, Welcome to Star Army. I am Kai, one of the resident GM's and character mods, and someone who spends more time than any sane person should on the internet. Feel free to ask me or any of the other Admins and Game masters (Blue, Green, and Yellow forum names) any questions you may have. Feel free to peruse the Wiki (I know it's a lot, but it helps).
As for your character, this is very good, the skills are a bit bare-bones and would benefit from a little more fleshing out (See: one or two more sentences)
The big problem here is the history. You've presented a number of names of worlds and planets, as well as stations that simply do not exist in this setting. The 'core worlds' of Yamatai happens to be just one world; Yamatai itself. there are a few nearby systems, such as Tami, that may count as core worlds, but you have not used any of them, instead making up others I have never heard of in my four years on this site.
While the story of the history is solid, it sounds more like something that would happen on Nepleslia than on any Yamataian world, as gangs and violence are much more prevalent there.
I would say, change the worlds where he may have grown up to a Nepleslian system (Nepleslia, Delsauria, etc) and change the colony they ran to to a Yamataian world (Such as Tami) Those simple changes will make this character fit in the setting and you will be able to get going quickly.