GUNBARREL isn't much in the personality department. He arely speaks, and prefers his vehicle mode to robot mode. He doesn't use his brain module much, except to work out firing solutions on distant targets. In fact, he'd have his brain removed entirely if it'd make room for another cannon. His firepower is unmatched. Anyone up against him in a fight should just be thankful that his imagination and intelligence doesn't match the power of his weapons.