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Robo-joe
Hamtaro and Joe
Hamtaro robo-joe

Robo-Joe (メカじろう, Meka Jirō/Mecha Jirō)

Created by Laura's grandpa, Robo-Joe is a robot hamster whose appearance seems to be based on Hamtaro. Robo-Joe's main function is the ability to learn and mimic what he hears; both human language and Ham-Ham language. In a later Japanese episode, Laura's grandfather places a slightly modified Robo-Joe in a Battlebots-like tournament.