The Prince has a very large extended family. There are 39 cousins you can collect, and play as, in WLK. If you need more help on finding them, there is a helpful guide on GameFAQs.
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Ace[ sound ]
Tutorial
A cousin who switched butts to a spikier model. It hasn't been generating much buzz.
Beyond[ sound ]
Friends ALAP
A healthy second cousin who only eats fruit and vegetables. The pants he's wearing are custom-made.
Can-CanMake a Planet 2
A stubborn second cousin. When he disagrees with something, he rotates his head so fiercely that it catches fire.
Colombo[ sound ]
Friends AFAP
A shaggy cousin. He's at a loss on what hairstyle to choose, but it's not just a hairstyle problem anymore.
Daisy[ sound ]
CowBear Level
A second cousin whose pink feet shoot out milk, making it hard for her to run. A mammal who's loose with her time.
DippFirefly Level
A cousin who sparkles a lot and gets carried away with things. We wish he knew the difference between sticking out and just being a nuisance.
DroobyMake a Planet 5
This second cousin has strength and flexibility. She can tell how well done a roast is with her fingertip.
Foomin[ sound ]
Make a Planet 4
A cousin with two heads. Her left and right brains are completely separate, but she isn't particularly smart.
Fujio[ sound ]
Raincloud Level
A cousin who We think has gotten older. The volcano on his head doesn't erupt often, but it is still active.
HavanaMake a Planet 2
A cousin who gets in the way when you stand next to him. His sole redeeming feature is that he's never fallen into a manhole.
HoneyGingerbread House
A cousin who messes up just about everything she does. Oddly, she never screws up when nobody is looking at her.
HueySchool (AFAP)
A timid second cousin who's always worried about other people. Praise him, and his face just lights up. How pure.
IchigoFlower Garden
A cousin with a strawberry figure. She's in the habit of eating only the strawberries in her strawberry shortcake.
Johnson[ sound ]
Make a Planet 3
A cousin who looks a lot like the Prince from certain angles. Apparently, he was once so surprised that his face jumped out of his body.
JuneRaincloud Level
A cousin who's happy even in the rain. She likes going out on rainy days, or maybe it just rains whenever she goes out.
Jungle50 Items Level
A cousin good at blending in with surroundings. He's worried about how people always leave him behind during trips.
KinokoCampfire (Medium/Large)
A slightly annoying second cousin who kicks up lots of dust whenever she moves. So she doesn't move much, out of courtesy.
KuroMake a Planet 3
A lone-wolf cousin who likes to be alone. No matter how much time passes, he never goes back home.
L'AmourCleanup Level
This second cousin is like Cupid. The hearts on her body change whenever she gets a couple together.
Lalala
LuchaMake a Planet 5
This second cousin is a masked pro-wrestler. He is very protective of his private life.
MachoMake a Planet 1
The upside-down triangle look of this second cousin has been with him since birth. He looks strong, but he's a pacifist who hates fighting.
Marcy[ sound ]
Make Saturn (Small)
A precocious cousin who recently discovered the world of fashion. She hasn't found anyone she likes yet, though.
MarnyUnderwater
We don't know who this is, but he's good at scuba diving. He pretends to be a shell at the bottom of the sea on a daily basis.
Miki[ sound ]
Make a Planet 4
This second cousin wants to be in the top three in whatever she does, but she usually ends up around sixth place.
MisoSchool (ALAP)
A cousin with a smell We find very relaxing. She isn't very good at strenuous exercise.
NickelRacetrack
A cousin who moves smartly now with wheels attached. Now that he's using two batteries at once, his power went up 20%.
Nik[ sound ]
Sumo Level
A cousin who eats too much. Although he wasn't even dieting, he says he gained it all back.
Nutsuo[ sound ]
Make a Planet 5
This second cousin's hands could never, ever reach his face. We wonder how he eats his food.
Odeko[ sound ]
Racetrack
A vain cousin. He's proud of his height, but he doesn't realize that his vantage point is still the same.
Odeon[ sound ]
Save the Pandas
We are not sure where the neck is on this second cousin. He always needs help when putting on a scarf.
Opeo[ sound ]
Origami Level
A cousin who's always in bad physical condition. He's good at catching inscrutable diseases.
Peso[ sound ]
Make Saturn (Medium)
A cousin who dreams of the stars. He's given up dancing and taken up golf instead.
Shikao[ sound ]
Make a Planet 5
A cousin who does nothing but watch TV. He turns his face away while watching scary shows. That's how his head ended up like this.
Shy[ sound ]
Racetrack
A gold medalist second cousin who can swim the 100-meter freestyle without lifting her face to breathe.
Signolo[ sound ]
Make Saturn (Large)
Not even this second cousin knows which is his real face. Good at switching from one to the other to keep people guessing.
Slip[ sound ]
Tutorial (play as Ace)
A second cousin who can move through the air on windy days. His presence is slight.
Twinkle[ sound ]
Make a Planet 3
A second cousin who damages things just by walking around, including himself. But he's still a nice guy.
Velvet[ sound ]
Make a Planet 4
It's been a while since this cousin stood on her own two feet. She's gotten taller since last time, so she doesn't need to float anymore.