Mario Kart X

Default

 * 001 - Mario
 * 002 - Luigi
 * 003 - Toad
 * 004 - Yoshi
 * 005 - Wario

After 50cc Mushroom

 * 006 - Waluigi
 * 007 - Bowser
 * 008 - Bowser Jr.
 * 009 - Toadette
 * 010 - Toadsworth

After 50cc Flower

 * 001a - Fire Mario
 * 002a - Ice Luigi
 * 001b - Metal Mario
 * 011 - Peach
 * 011a - Pink Gold Peach

After 50cc Star

 * 012 - Daisy
 * 013 - Rosalina
 * 014 - Larry Koopa
 * 015 - Iggy Koopa
 * 001c - Gold Mario

After 50cc Special

 * 016 - Donkey Kong Jr.
 * 017 - Donkey Kong
 * 018 - E. Gadd
 * 019 - Diddy Kong
 * 020 - Dixie Kong

After 50cc Shell

 * 021 - Koopa
 * 022 - Paratroopa
 * 023 - Hammer Bro.
 * 024 - Sledge Bro.
 * 025 - Spiny

After 50cc Banana

 * 026 - Cranky Kong
 * 027 - Special Kong
 * 028 - Eddie The Yeti
 * 029 - King K. Rool
 * 030 - Kremling

After 50cc Leaf

 * 001d - Tanooki Mario
 * 001e - Racoon Mario
 * 002b - Green Bronze Luigi
 * 002c - Classic Luigi
 * 002d - Dr. Luigi

After 50cc Lightning

 * 002e - 64-bit Luigi
 * 001f - Dr. Mario
 * 001g - 64-bit Mario
 * 001h - Boxer Mario
 * 001i - Tennis Mario

After 50cc Egg

 * 004a - Red Yoshi
 * 004b - Blue Yoshi
 * 004c - Yellow Yoshi
 * 004d - Brown Yoshi
 * 004e - Purple Yoshi

After 50cc Bell

 * 001j - Cat Mario
 * 001k - White Tanooki Mario
 * 001l - Old Mario
 * 001m - Teen Mario
 * 001n - Baby Mario

After 50cc Spiny

 * 002f - Baby Luigi
 * 002g - Teen Luigi
 * 002h - Old Luigi
 * 002i - Mama Luigi
 * 031 - Buzzy Beetle

After 50cc Cape

 * 032 - Spike Top
 * 033 - Swooper
 * 034 - Wiggler
 * 035 - Lakitu
 * 001o - Cape Mario

After 50cc All Cup Tour

 * 036 - Shy Guy
 * 037 - Birdo
 * 038 - Ashley
 * 039 - Goomba
 * 040 - Piranha Plant

After 200cc All Cup Tour

 * ??? - Funky Kong