To unlock the characters listed below, fulfill the corresponding requirement listed.
* Baby Daisy - Head over to Peach Garden and use Wario’s magnet to pull Daisy’s baby rattle from the fountain. Then, use Yoshi to head through the manhole cover on the left side of the garden, which will bring you to a location where a baby is crying. Hand her the rattle and she’ll join you.
* Baby DK - In the DK Jungle, use Yoshi’s power to free him from a palm tree he’s stuck in.
* Baby Peach - Head over to Peach Garden and use Princess Peach’s heart power on the grass Toad statue.
* Blooper - Head to the dock in Mario Stadium. Have Princess Peach use her heart power on the bubbles in the water.
* Funky Kong - In the DK Jungle, save him from the Hammer Brother.
* King K. Rool - Head over to the DK Jungle and defeat all four Kritters. You can then go to the waterfall, defeat him, and he’ll join.
* Kritter - In the DK Jungle, defeat King K. Rool.
* Tiny Kong - In the DK Jungle, defeat Bowser Jr.
* Wiggler - Go to Yoshi Park and seek out the roller coaster. Reset the roller coaster that Wiggler is riding, and he’ll come down and join you.