Waverider is, in a word, bipolar. While outside of combat he's a friendly enough guy, in combat he is a raging berserker, with Ursus having once said that he looked like 'Zero during the Insurrection on the battlefield.' His ferocity comes from his dedication to the Maximal cause. He simply does not know any other way to show his support than by beating the Predacons. He is best friends with Groundbreaker, and the two were roommates before the expedition. The only person he doesn't get along with is Steeljaw, and that's because of the whole 'cat+water' deal. That and that Steeljaw can't swim.