Cousin

Cousins are a collection of 57 characters that are the cousins of The Prince, and act as side characters. As of We Love Katamari, you can play as any cousin you collect in a stage. Cousins are purely asthetic, and don't change gameplay at all.

Story
Cousins don't have a major plotline in most games, until it comes to rolling the Katamaris. The only game thus far where they had a pivotal role was in Katamari Forever, where they help the Prince create the Roboking, which later becomes part of the main problem in the game.

Katamari Damacy
All cousins introduced in Katamari Damacy are known simply as "Cousins". There were 23 cousins in this game. Note: In order to collect these cousins, you need to complete Make The Moon first.
 * Marcy
 * Havana
 * Jungle
 * Johnson
 * Nik
 * Honey
 * Nickel
 * Miso
 * Shikao
 * June
 * Velvet
 * Dipp
 * Ace
 * Lalala
 * Odeko
 * Peso
 * Marny
 * Foomin
 * Kuro
 * Columbo
 * Opeo
 * Ichigo
 * Fujio

We Love Katamari
All cousins introduced in We Love Katamari are known as "Second Cousins". There were 16 cousins introduced in this game. In some cases, where more than one cousin is to be found in the level, the player would have to play the level again to obtain said cousin. Some cousins have had slight changes in appearence since Katamari Damacy. Note: In levels with more than one cousin, you need to play the levell the same amount of times as haw many are in that level to obtain them all.
 * Beyond
 * Can-Can
 * Daisy
 * Drooby
 * Huey
 * Kinoko
 * L'amour
 * Lucha
 * Macho
 * Miki
 * Nutsuo
 * Odeon
 * Shy
 * Signolo
 * Slip
 * Twinkle

Me & My Katamari
All cousins introduced in Me & My Katamari are known as "Rookies" and have their own seperate collection catagory. A total of 8 cousins were introduced.
 * Ban-Ban
 * Hans
 * Kenta
 * Mu
 * Nai-Nai
 * Norn
 * Paula
 * Pokkle

Beautiful Katamari
All cousins introduced in Beautiful Katamari are known as "Half-Cousins", and have their own space in the collection. Just like in Me & My Katamari, there are 8 cousins introduced (Since it is unknown whether the Princess is really the Prince's sibling, a cousin with a "Princess" theme, or a character with no blood relation with the Royal Family, she's still considered a cousin)
 * Harvest
 * Kunihiro
 * Kyun
 * Mag
 * The Princess
 * Pu
 * Ryu
 * Sherman

Katamari Forever
Unlike previous games, the cousins introduced here don't have a family denomination. Also, there where only 2 cousins introduced, and their names are different between the japanese release, and the overseas version. In Touch my Katamari, there aren't any cousin introduced, nor it brings all the previous cousins back. It only brings back a handful of cousins, mostly with new attires. Also, there were numerous new cousins in Katamari Damacy Online, but since it didn't have an internationa release, these cousins are unknown (or whether they are cousins at all, or creatures with cousin-ish looks)
 * Dangle
 * Drive