Moonrock is a veteran, plain and simple. Like his friend Ironfist, he is old and grouchy, but willing to train youngsters. Primus, he even taught Yoketron himself. After his former student's death, he took on the task of training new Cyber-Ninjas, like Lightspeed and Drift (then known as Deadlock). He was saddened by the latter's kidnapping, so he joined the Wreckers with Lightspeed, only as a reservist.
Moonrock is armed with twin arm shields. He also has steel reinforced fists and his cuffs are really knives. His foot has extra springs for bouncing.