Mini (ミニ,Mini?) and Mum (マム,Mamu?) are green and blue colored flying robots who serve as Captain Whisker's first mates. They are helpful to the Captain, who would be lost without them. Mini sits on the Captain's left shoulder, and Mum sits on his right.
Mini and Mum are perhaps more alert and scheming than they appear. They are Eggman and Eggman Nega's robots, created to help Captain Whisker retrieve the Jeweled Scepter (which was in Princess Blaze's possession) in Sonic Rush Adventure. After the Ghost Titan is defeated, it is unknown what happened to them. They were likely destroyed within its vicinity as they are not seen again for the rest of the story.
In the story arc "Pirate Plunder Panic", Mini and Mum served a minor role in the said arc, as they only stood by and watched Johnny steal a Sol Emerald from Captain Metal. Mini and Mum also had agitated Captain Whisker by giving remarks on the captain's comments on eventually rising up against Doctor Nega. Mini and Mum would then watch the fight between Blaze's crew–Amy, Cream, Marine, Bark, and Bean–and Captain Whisker's crew. Whisker then decided to leave right after the Egg O' War launched, but Whisker gave a fellow "leaving present" to Marine. Whisker left right after shooting Marine's ship, which was the Metal Marauder. (SU #57, #58)