Mario Kart Wii/Characters

The weight of each character has little effect in and of itself, but will affect the types of vehicle available to the player.

Lightweight

 * Toad
 * Koopa Troopa
 * Baby Mario
 * Baby Peach
 * Dry Bones
 * Toadette

Middleweight

 * Mario
 * Luigi
 * Peach
 * Yoshi

Heavyweight

 * Wario
 * Donkey Kong
 * Bowser
 * Waluigi

Unlockables
Note: In order to unlock characters via Time Trials, you must also restart the game in order for it to take effect.

There are 3 ways to unlock most karts, you only have to do one of these ways:

Lightweight

 * Baby Luigi
 * Unlock 8 Expert Staff Ghosts
 * Win 100 Wi-Fi Ghost Races
 * Play 3,150 races

play against peach 20 times
 * Baby Daisy
 * Get a 1 Star Rank for all 50cc Wii Cups


 * Dry Bones
 * Get 1st place in the 100cc Leaf Cup
 * Play 1,050 races


 * Toadette
 * Play on all 32 courses in Time Trials
 * win 1,000 Wi-Fi races
 * Play 3,150 races

Middleweight

 * Daisy
 * Attain a Gold Trophy in 150cc Special Cup.
 * Play 2,850 races


 * Diddy Kong
 * Attain Gold Trophies in all 50cc Cups.
 * Play 450 races


 * Birdo
 * Beat 250 people while playing online, or
 * Play on 16 courses in Time Trials.


 * Bowser Jr.
 * Attain at least 1 Star Rank for all 100cc Retro Cups.
 * Play 3,450 races

Heavyweight

 * King Boo
 * Attain a Gold Trophy in 50cc Star Cup.
 * Play 750 races


 * Rosalina
 * Have a Super Mario Galaxy save on your Wii.
 * Win 50 races
 * Get a 1 Star Rank for all 150cc Mirror Grand Prix cups
 * Play 4,950 races


 * Funky Kong
 * Unlock 4 Fast Staff Ghost Data in Time Trials.
 * Win 25 Wi-Fi Ghost Races
 * Play 2,250 races


 * Dry Bowser
 * Attain at least a 1-Star Rank in all 150cc Nitro Grand Prix Cups.
 * Play 4,350 races

Miscellaneous

 * Mii (Outfit A)
 * Attain a Gold Trophy at 100cc Special Cup.
 * Play 1,650 races


 * Mii (Outfit B)
 * Unlock all Expert Staff Ghost Data in Time Trials.
 * Win 5,000 Wi-Fi Ghost Races
 * Play 5,100 races