Both are tritagonists and best friend that is opposite gender from the protagonists. (Samuel for Rudy, Milli for Bot)
Both are different species from her/his best friend and her/his younger sibling. Muffin and Samuel are lovebirds while Rudy is a cockatoo, while in Team Umizoomi, Geo and Milli are not robots, but Bot is a robot.
Both are usually best friends to the protagonists (Samuel for Rudy, Milli for Bot), but they also are good friends to deuteragonists that is same gender to them. (Muffin for Rudy, Geo for Bot).
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