Gambit Defender
Gambit is a Defender, though his defense is a bit different. Where other Defenders hold a position, Gambit makes it costly for the other team to attack him and his allies.
Every shell that lands on Gambit becomes Jamming aimed straight back at whoever fired it, and the closer they were when they shot, the worse it goes for them. Ram him and it gets worse still.
A swarm of repair drones sweeps over every ally in range, snapping broken tracks back together and stacking temporary hull and shield protection on top. A squad seconds from collapsing becomes one the enemy has to break all over again.