Ricky Ricotta's Mighty Robot

Ricky Ricotta's Mighty Robot is the titular deuteragonist of Dav Pilkey's book series of the same name. He is the best friend of the possessive protagonist Ricky Ricotta. Originally, he was created by the first book's villain Dr. Stinky. Since the end of the first book, in which he is only a secondary character, he has been Ricky's best friend.