Rollbar  

Greejeeper

Rollbar is an expert in hand-to-hand combat and practices Crystallocution, a Cybertronic martial art that involves attacking opponents by targeting their metal fracture points. He also enjoys Earthly martial arts and prefers fighting in Arctic environments or on rainy days. When combined with his fellow Combiners, Rollbar forms the giant robot Ruination. Known for his sardonic sense of humor, he often uses it to lighten the mood among his teammates and when facing Autobots.