The weight of each character has little effect in and of itself, but will affect the types of vehicles available to the player. There are 12 characters available at the beginning, 12 additional characters and 2 Mii Outfits can be unlocked.
Character
Weight
Baby Daisy
Lightweight
Baby Luigi
Lightweight
Baby Mario
Lightweight
Baby Peach
Lightweight
Birdo
Middleweight
Bowser
Heavyweight
Bowser Jr.
Middleweight
Daisy
Middleweight
Diddy Kong
Middleweight
Donkey Kong
Heavyweight
Dry Bones
Lightweight
Dry Bowser
Heavyweight
Funky Kong
Heavyweight
King Boo
Heavyweight
Koopa Troopa
Lightweight
Luigi
Middleweight
Mario
Middleweight
Mii (Outfit A)
Varies on the size you made your Mii on the Mii Channel
Mii (Outfit B)
Varies on the size you made your Mii on the Mii Channel
