The cousin info has been taken from slo_bro's faq over at game faq's with his permission. I did not write this, I'm merely expanding the reach of this info. Enjoy.
TUTORIAL
Mouse Stage
Camera - carried by an angel
SHIMANO HOUSE - indoor area with the Shimano kids and with Ace
Turtle Stage Eternal, Turtle Stage, Royal Monument Stage
Flower - under the bed, go through the hole in the wall in the boy’s room
JOUSHIMA VILLA - indoor area with two guys sitting around & with a masked cat
Turtle Stage Eternal, Panda Stage, Elephant Stage
Elephant Nose - on a lump of the bed on top a kaleidoscope
MODEL SHOP - indoor area with a guy polishing a fish statue and with Havana
Turtle Stage Eternal, Octopus Stage, Polar Bear Stage
Scarf - Ride up to the top level on a shogi board carried by pigeons. Go past
the bird nest, across the swords, all the way to the corner of the room.
MAPLE TOWN - snowy, day into evening
Canary Stage Eternal, Cat Stage
Earmuffs - on a bear’s back, gotta be 55cm, disappears at 75cm
OAK TOWN - day into evening
Canary Stage Eternal, Cheetah Stage, Whale Stage
Train - on top of a car
SAKURA TOWN - evening into night, lots of drunks staggering about
Canary Stage Eternal, Canary Stage
Sunglasses - behind a Winner’s Podium under a tent, beyond 75cm barrier
STRAWBERRY CITY - day into evening, with a golf course
Gold Bug Stage Eternal, Gold Bug Stage
Royal Mask - hanging from some construction girders, beyond 4m barrier
MELON CITY - snowy, day into evening, with racetrack
Gold Bug Stage Eternal, Dolphin Stage
School Bag - a bird is carrying it next to the tall campfire wood piles, before 4m barrier
BANANA CITY - evening into night, with zoo
Gold Bug Stage Eternal, Crab Stage
Guardian Angel - sitting on a ledge just off a cliff, beyond 4m barrier
RADISH LAND - evening into night
Cicada Stage Eternal, Beetle Stage Eternal, Cicada Stage
Dragon Hat - on the nose of a shark jumping out of a little lake, before 30m barrier
POTATO LAND - day into evening, with donut-Rookie Ban-Ban
Cicada Stage Eternal, Beetle Stage Eternal, Beetle Stage
Armor - hanging from a crane right behind where you start
ZUCCHINI LAND - snowy, night into day, you start in the water
Cicada Stage Eternal, Beetle Stage Eternal, Peacock Stage
Mask - on top of the train bridge, before 30m barrier
RICE STATE - day
Peacock Stage Eternal second area when you start in RADISH LAND
Wings - on a tiny island (turtle?) that submerges next to pointy red Oni rocks
CORN STATE - evening
Peacock Stage Eternal second area when you start in POTATO LAND
Wild Hair - on a high airship flying near the tall tower
WHEAT STATE - night (snowy)
Peacock Stage Eternal second area when you start in ZUCCHINI LAND
King’s Mask - a very high airship is carrying it around a big snowy mountain
SUNFLOWER CONTINENT - the big time
Royal Monument Stage last area
Cloak - on a huge tornado
ANT STAGE
SHIMANO HOUSE (EVENING) - Sweets stage
Lollipop - climb a tree made of bananas, or come back when you’re big
CRANE STAGE
PERSIMMON CITY - Age stage
Samurai Hair - a witch is carrying it near where you start, get fairly big first
GORILLA STAGE
BAMBOO LAND - Rocket stage
Thunder Drums - on top of a lighthouse on a whale in the middle of the water, get fairly big first
CHAMELEON STAGE
BIRCH TOWN - Requests stage
Crown - go up the stairs and a woman circled by kids is holding it, beyond 80cm barrier
CAMEL STAGE
TRUFFLE DESERT - Money stage
Bandage - in a corner, you’ve got to be at least 1m38cm