Mu is a rookie first introduced in Me & My Katamari. Mu is a cousin who wears black clothing. His eyes, however, are not shown but there are four dots in his face. He is not really good making friends, but always keeps his promises.
Where/How to Find: Banana City - On top of a hill with a lion and a centaur past the 4m barrier. Once you are on the hill, pick him up quickly, as he will fall through the ground if he sees you.
Size: less than 4m
Description: A second cousin who likes black clothes. He makes it a rule to always keep his promises.When Rolled Up: "Hmm? We feel something sinister... It's the rookie, Mu! Scary..."
Where/How to Find: Seadome - standing on an island in the lake by the airport.
Description: A second cousin who likes black clothes. He makes it a rule to always keep his promises.
Cousin Leaderboard Description: A second cousin who likes black clothes. Not very sociable, but he always keeps his promises.
When Rolled Up: "Hm? Something creepy... It's Mu! Why aren't you in the Fortean Times?"
Where/How to Find: Farewell! - Once you collect all of the hearts, you must go to the corners of the stage and pick up random objects like a Haniwa, Geta, Recorder, Dandelion and an Emblem. Once you get the Emblem, Mu will appear on the opposite side of where you picked it up.
Size: Unknown, but you will be large enough
Description: He likes to wear black clothes. He always keeps his promises
When Rolled Up: I think you just rolled up a lost continent. Oh! It's Mu. I have nothing else to say.
Mu is a special cousin that can be obtained by spending Candies.
Description: A second cousin who likes to wear black clothes. He makes it a rule to always keep his promises.