Robo-Joe (メカじろう) is a robot hamster whose appearance seems to be based on Hamtaro. He was created by Laura's grandpa. His main function is the ability to learn and mimic what he hears; in both human language and Ham-Ham language.
Robo-Joe is a robot, meaning he does not feel any compassion for the Ham-Hams or anyone else. He does, however, recognize evil and does help out when necessary. He mimics anyone and anything living, and repeats whatever phrase or noise they say whenever he wants. He is usually seen spitting random phrases and sounds that he has collected over time. Robo-Joe can, for the most part, outrun anyone and anything; he is extremely fast. He will always run out of battery eventually, though.
Over the course of the series, Robo-Joe shows off several different abilities, including:
- Plane transformation (in Groovy Robo-Joe).
- "Overdrive" mode - becomes stronger (in A Big Change for Robo-Joe!)
- Flight via propellers (in Hyper Robo-Joe!)
- Digging (in Super Digger Robo-Joe)
- Main article: Robo-Joe/Gallery