I think most of what I wanted to say has already been said, which I definitely appreciate.
Two more things though:
1. If the exo-skeleton robotic arm has any features other than the ones you've already mentioned, please mention them now, either here or in the Tech section. I assume by your wording that it wraps around his organic arm.
2. From what you've said so far, I'm worried that you're only doing this for JoMidori, and don't really want to or care to be here. If this is true, then I doubt that you'll have any fun here, and no one would ever contribute positively toward a RP if he or she is not having fun. All I'm asking for is that you take a moment to check your intentions, and ask yourself whether you're truly interested in this RP setting or not, whether you would RP here if you discovered it by yourself. (It's a bit different from a generic sci-fi setting, if you haven't noticed already.) If the answer is still "yes", then we're glad to have you, and any character issues can be worked out.