Ryu

Ryu is a ninja cousin who first appeared in Beautiful Katamari. As of December 26, 2009, he has won 4 Cousin of the Week polls.

Beautiful Katamari, Matching Game, and Katamari Forever
Apparently, this cousin can perform some mysterious moves, however, We have yet to see them.

Beautiful Katamari
Level: Sunrise Castle

How to Find:  Hanging upside down from the white bridge over the river. You need to be about 1.2m to reach him.

Katamari Forever
Level: Make a Star 11

How to Find: At the top of the wrestling rings after getting Nickel.