Admiralty board handles Exile. Also, maybe have him be a little more successful on the fighter theft? Exile is literally the worst thing that can happen to a Quarian under their law, its basically akin to the death sentence on Earth today. I can understand why he'd choose to do it, Quarians are very social creatures and their families are very close-knit so their suffering'd have a strong effect on him, but maybe ramp it up to him succeeding on his theft and lining up a target or even firing shots. Quarian ships do have Kinetic barriers so the fighters weapons would probably be ineffectual, but willing friendly fire would be enough for the board to consider Exile I think.

On an unrelated note, I think a little explanation should go into how he learned to handle a sniper, a rare weapon among the Migrant marines because they usually fight in close quarters e.g. in boarding actions, their most common deployment.

And uh, his powers seem odd... Tactical cloak I get, (I could bring up some lore points on that but I feel like that'd be too picky.) But what are 'Slide' and 'Storm' ?
You know you can also take a few more than three powers if you want, I think the highest any char has right now is six, though of course, no biotics because Quarians don't have them.

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Oh by the way Kasyra will hate your char for being an exile... Though she hates a lot of people so don't take it personally...