Bio: A4 was a construction robot, and therefor possesses great strength. He and the other construction robots had killed the entire crew of the construction site and ran away. His superior speed would've outmatched that of the human cops that were chasing him, if his battery didn't die at that exact moment. Luckily he was freed by robotic freedom fighters soon thereafter, and recharged. He now fights by their side, against the human 'oppressors'...
Weapons: He carries a machine gun with him, but his great strength also allows him to smash his opponents to pieces.
By the way, are we in a specific place, or is this all around the world? and are the robots doing well, or are they evenly matched or even losing?
EDIT: I looks like one o' these fella's: