@gamer5910 If I can give some constructive criticism on your guy, I think you should fix up his weapon a bit. To go from a handgun to sniper rifle to sub-machine gun is a lot farfetched considering how big sniper rifles have to be to function, also I think you should only stick to one gun, since in the show you never see a weapon with two different gun types, and for good reason, as every type of gun uses different ammunition, and so your weapon would also be impossible to use given the vast difference between all the weapons.
The next thing is you sembalance, which is rather against the flow of Sembalances in the show and this RP. In the show, Sembalances are supplememtary to the fighting style of each character(Yang getting stronger with every hit, Ruby's speed, Blake's Clones, Weiss's Glyphs), as is the same for this RP as far as the characters we have. So if you want to have you guy use dust, then just have him go with the Dust in clothing method, it's awesome, effective, and makes you look like a total badass when your clothes start to glow.(1/1 Cinders agree with this statement)
I suggest that your guy use a handgun mixed with shortswords or SMG's mixed with daggers. I really don't see why you added Sniper Rifle, as it contrasts heavily with his fighting style of quick and light attacks. As for a Sembalance, how about Dust enhancement, making his use of Dust more effective than normal, or a sigil thing similar to Weiss's sembalance. Just my thoughts on the matter, do with it as you will.