The only characters you have to unlock are Toad, Toadette, Petey Piranha, and King Boo.
How to unlock them:
Toad, Toadette, and Toad Kart - Win in first place on the 100cc Special Cup
Special Cup - Get a 1st place on the Star cup on 100cc
King Boo and Petey Piranha - Get a 1st place on the Mirror Mode Star cup
Mirror Mode - Get a first place in the All Cup Tour on 150cc
All Cup Tour - Get a 1st place on the 150cc Special Cup
No but they are in Mario Kart Wii.
Like Mario Kart Double Dash you can unlock him and in some Mario Marioparties.
you should already have it because when i first got Mario kart double dash star cup was the first grand prix i raced in
You cannot unlock Baby Mario in Mario Kart DS. He is only in Mario kart: Double Dash!!! and Mario Kart Wii.
king boo toad and toadettee and peaty pirahna
Finish all 150 CC cups and you will get the allcup tour.
Yes it is since Mario Kart Double Dash is a Mario Kart game
Mario Kart: Double Dash has already come out (for Gamecube ).
No, Mario Kart Double Dash is only for the Nintendo GameCube
Diddy Kong is not an unlockable character in Mario Kart DS. The Mario Kart games that he's playable in are Mario Kart: Double Dash and Mario Kart Wii.
No, this mechanic only exists in Mario kart double dash.
Mario Kart Double Dash is the fourth game of the Mario Kart series. Mario Kart as well as all Mario games are developed by Nintendo. Mario Kart Double Dash is produced for the GameCube system.