Unlocking the Characters

Baby Daisy: Get a “One Star” rank or better in all 50cc Cups.
Baby Luigi: Unlock eight Expert Staff Ghost Data** in Time Trials mode.
Birdo: Play 16 different courses in Time Trials mode.
Bowser Jr.: Get a “One Star” rank or better in all 100cc Retro Cups.
Daisy: Win* the 150cc Special Cup.
Diddy Kong: Win* the 50cc Lightning Cup.
Dry Bones: Win* the 100cc Leaf Cup.
Dry Bowser: Get a “One Star” rank or better in all 150cc Wii Cups.
Funky Kong: Unlock four Expert Staff Ghost Data** in Time Trials mode.
King Boo: Win* the 50cc Star Cup
Mii- Outfit A: Win* the 100cc Special Cup.
Mii- Outfit B: Unlock all 32 Expert Staff Ghost Data** in Time Trials mode.
Rosalina: Get a “One Star” rank or better in all Mirror Mode Wii-Cups. Or if you have a saved game file from Super Mario Galaxy, you should win 50 Grand Prix races.
Toadette: Play on all 32 courses in Time Trials mode or win 1,000 Wi-Fi online matches.

*= To win a cup, that means coming in first place in points.
**= To unlock Expert Ghost Data, you must race the regular ghost data and beat it by at least 7 seconds.