Onslaught is a giant dark blue, metal-plated robot that stands over 20 feet tall. He has a large, powerful build and a menacing appearance, with multiple weapon systems and armor plating covering his body. He possesses immense strength and durability, allowing him to shrug off even the most powerful attacks. Onslaught also possesses a number of advanced weaponry, including a powerful energy cannon mounted on his torso, as well as an energy shield that can deflect energy blasts and melee attacks.