Bowzock's best mathemagician, he appears to play havoc with his staff to manipulate numbers like those in transfer check amounts and the price of items in stores. The Carrangers catch up to Rappa as he accidentally called Pink Racer heavy and escapes after she decked him in the nose. After being laughed at by his peers, Rappa vows vengeance as Inventor Grotch provides him a powerup backpack and the ability to use Number Bombs. Though he overpowers the four Carrangers on his own, an irate Yoko arrives, believing Rappa screwed up her scale with his magic and made her think she was fat, and revealing herself as Pink Racer as she gives him a beating of a lifetime. Eating Imo-youkan, Rappa battles RV Robo and is quickly killed off.