No cheat code unlocks all characters. Nintendo designed progression around earning stars in Grand Prix.
| Character | Unlock Condition |
|---|---|
| Baby Daisy | ★★★ 50cc Star Cup |
| Baby Luigi | ★★★ 100cc Star Cup |
| Birdo | ★★★ 150cc Star Cup |
| Bowser Jr. | ★★★ 100cc Special Cup |
| Diddy Kong | ★★★ 150cc Leaf Cup |
| Dry Bowser | ★★★ 150cc Lightning Cup |
| Funky Kong | ★★★ 150cc Star Cup (or 5,000 races) |
| King Boo | ★★★ 150cc Special Cup |
| Rosalina | ★★★ 150cc Mirror Cup (or 4,950 races) |
| Toadette | ★★★ 100cc Leaf Cup |
Homebrew/Gecko codes exist but risk Wiimmfi ban and save corruption. Earn them—it's the Mario Kart way.