Unlocking All Characters in Mario Kart Wii: All 24 Available from Start

All 24 characters are unlocked from the start. No character unlocks exist.

However, you unlock alternate costumes for specific characters by completing Grand Prix cups at each engine class:

• 50cc All Cups: Donkey Kong, Wario, Waluigi → Retro outfits.
• 100cc All Cups: Daisy, Toad, Yoshi → Baby outfits.
• 150cc All Cups: Mario, Luigi, Peach, Bowser → Metal outfits.

Mirror Mode (unlocked after 150cc) offers no new costumes.

So race every cup at every difficulty to dress up your favorites!