Ronaldo is the main nerd in Mellowbrook and one of Kick's many foes in Kick Buttowski: Suburban Daredevil. He usually counts on the laws of physics and mechanical engineering to help get him through all his problems. He is smart enough to create a car, as shown in Mellowbrook Drift. He is one of Kick's rivals and is also in a secret romantic relationship with Kendall Perkins in some episodes.