I would like to mention that I did design Trey to be more of a tank and a heavy hitter than a frequent speedster. He only has so much fuel in his body at a time and it's important for him to be careful when he uses his rocket engines.
A bit bummed people are shifting around mechanics on me though. Feels like nobody wants to partner. Like being picked last for dodge-ball. >.>
But yeah his personality is more supportive, so I always pictured him preferring a heavy role that goes out of their way to tank shots and take attention away from his teammates since his power was designed to make him nearly invulnerable. Unless he gets shot in the back of the knee or in the small fold in his shoulder or armpit he won't really need healing. Unless he gets shot by something big. Or shocked. Concussives will mess him up pretty bad sure since you know metal but I would argue it's more important for him to get a mechanic partner that is good with sensitive or complex machinery since he's one of the more analog units with physical tech in him. In fact at some point he'll have to get stronger too I'm sure so augmentation would be important so he would need an mechanic
based mechanic more that anything.
I don't mean to be negative or argumentative, but I did design him to be a birthed tank unit since I he was most likely to see combat than mechanics and be deployed in the field not as much of a flanker. In fact his only major offense is the harsh punches he can throw, and the very risky move of blasting high amounts of fuel to shoot heat out of his elbows if I wanted to be creative with the elbow rockets. Not to mention, rockets are loud and without them he isn't all that much faster than a normal person in shape.