So, there is a pretty definite ‘support’ branch of skills for the players, but nothing like this for the robots. What if we came up with something that is there in a support role for the robots. Nothing major for weapons, but maybe at the prototype level it throws out smoke clouds to make the enemies harder to hit for the players. At the military level their hits would slow the player down to make them easier for the other enemies to hit. At Fnix level they could heal the other robots they are with, maybe in a radius around them, or maybe they have little ‘drones’ they launch that repair the other robots - when you finally manage to kill the one launching the drones, they shut down. And the Apocalypse ones could do a combination of these. Maybe both healing other robots and slowing players with their hits?
I picture them as something small. Somewhere between Runner and Tick in size. Slower moving so they stay at the back of the fight and the player has to get through the other robots to stop them. You could call them ‘Agent’ or ‘Defiler’.