Adding onto what this guy said, I'd like:
3. Venka buff
4. Increase Volt's base runspeed. As a caster frame, he should move faster on base movement speed to make up for his less tankiness. And no, do not consider his speed ability, because that moves the whole team at high speed, still leaving you in the dust when playing with Rushing Random or when you are out of energy. Also, increase the hitting power of his damaging abilities if he truly is meant to be a powerful alternative to gunplay (meaning you'll have to beat Boltor Prime). Or fix his description. :P
5. Rework of the armor system.