Cheerleader Costume A
Defeat all the cheerleader blocks in Messy Park (Level 5)

Cheerleader Costume B
After unlocking Cheerleader Costume A, play Messy Park again (defeating all the cheerleaders)

Unlock Anthony White
Unlock Mimmy

Unlock Badtz-Maru
Stage 14: Collect all 3 of the keys. After obtaining the blue key, go 2 rooms back and unlock the doors on your right

Unlock Block Kitty
Complete Stage 14

Unlock Daniel
Stage 13: After opening 2 doorways, go to the left of room 3 and smash all the boxes to find Daniel behind them

Unlock George White
Unlock Mimmy

Unlock Hello Kitty
Unlock Mimmy

Unlock Keroppi
Stage 2: After going over the bridge, jump over the steel blocks onto the roof. Follow 2 planks along the roofs to find Keroppi

Unlock Kiki
Stage 5: After smashing the 2nd lot of barrels, go through the newly opened door on your right and to the far right of the train track to rescue Kiki

Unlock Koroppi
Unlock Mimmy

Unlock Kurin
Stage 10: In the large parking area, destroy the blue block before it runs through the hole in the fence to get Kurin from it

Unlock Lala
Stage 4: Find the yellow key from a blue block through the pink door, and open the yellow door near you to find Lala

Unlock Margaret White (1)
Stage 1: After going through the pink door, smash all the boxes to find Margaret White behind them

Unlock Margaret White (2)
Stage 11: After finding My Melody, make your way to the center ledge on the left wall to rescue Margaret White

Unlock Mary White
Unlock Mimmy

Unlock Mimmy
Stage 4: After opening the pink door, go to the right, jump over the hedge, and pull the lever. Go back to the cup ride and defeat all enemies

Unlock Monkichi
Stage 7: At the freezer entrance turn right and smash all the boxes to the right to get to Monkichi

Unlock My Melody
Stage 11: After running from the giant ball, turn to the right and talk to My Melody

Unlock Pochacco
Stage 8: Make your way to the far right corner of the room and jump to the top of a ledge here to find Pochacco

Unlock Pochi
Stage 13: After pressing the button to turn the bridge around, go across and talk to Croc to the left of you

Unlock Purin
Stage 4: After opening the yellow door, go to the far right. Pull the lever when the "Help!" is positioned at the bottom of the ferris wheel

Unlock Runabouts
Stage 10: After defeating the big block, go through the new opening and straight forward until you find Runabouts