Baby Daisy: Get at least 1-star rank in all 50cc Wii Grand Prix cups
Baby Luigi: Unlock 8 Expert Staff Ghosts in Time Trials
Birdo: Complete 16 different Time Trial courses
Bowser Jr.: Get at least 1-star rank in all 100cc Retro Grand Prix cups
Daisy: Win the 150cc Special Cup
Diddy Kong: Win the 50cc Lightning Cup
Dry Bones: Win the 100cc Leaf Cup
Dry Bowser: Get at least 1-star rank in all 150cc Wii Grand Prix cups
Funky Kong: Unlock 4 Expert Staff Ghosts in Time Trials
King Boo: Win the 50cc Star Cup
Mii Outfit A: Win the Special Cup on 100cc
Mii Outfit B: Win the Special Cup on 150cc
Mii Outfit C: Win the Special Cup on Mirror Mode
Mii Outfit D: Unlock all 32 Expert Staff Ghosts in Time Trials
Rosalina: Get at least 1-star rank in all Mirror Grand Prix cups or have a Super Mario Galaxy save file and win the 50cc Star Cup
Toadette: Unlock 1 Expert Staff Ghost in Time Trials or play 1,000 races
Toad: Win the 50cc Mushroom Cup
Waluigi: Win the 150cc Flower Cup
Wario: Win the 100cc Flower Cup
Baby Peach: Unlock 8 Expert Staff Ghosts in Time Trials or play 50 races