Ken Tenninbayashi is the eldest son of the family running Pukarin Company, a long-established enterprise specializing in robot development and rental. He takes the helm as the primary pilot of the Carrier Saver, a key rescue robot deployed by the Saver Kids team against the villainous Scrap Squad. His younger siblings include Gou, the youngest son and Sky Saver pilot, and Ran, the eldest daughter who serves as his co-pilot aboard the Carrier Saver. Ken possesses a strong will and notable kindness, particularly evident in his role as an older brother, though he also displays an absent-minded streak. Professionally, he shares sales responsibilities for the family company with his mother, Umeko. A distinct physical trait is his resemblance in appearance and build to Arsène Lupin III, the iconic character created by Monkey Punch. Ken operates from the Carrier Saver, the team's critical unit, which also occasionally transports his grandfather, Matsugorou, founder of Pukarin Company and the Saver robots' developer.