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.
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..."
Stage Conclusion: "Oo, slipped Our silky mind. You had someone rolled up. We'll pop 'em over to Beanstalk Island. Grace them with a visit, yes?"Mask: Blacked Out Face
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?"
Stage Conclusion: "Shivers, something eerie. It had to be you, Mu. We have UnCon tickets for you in the Princedom."
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: 690 Cosmos
Description: A cousin who likes black clothes. He makes it a rule to always keep his promises.
When Rolled Up: "I think you just rolled up a lost continent. Oh! It's Mu. I have nothing else to say."
Stage Conclusion: "Huh? Dangling thing... Mu? Come to hang out?"
How to Obtain: As a Special Cousin, he is obtained in random order for Candies.
Description: A second cousin who likes to wear black clothes. He makes it a rule to always keep his promises.
- There is a "lost" mythical continent in the Pacific Ocean with the same name as Mu, this is being referenced when Mu gets rolled up in Katamari forever.
- He can be found in Dangerous Colony and Make a Star - Danger in Beautiful Katamari and Katamari Forever, he’s standing on an island in the polar region.
- He can be rolled up at 300m.