You cannot unlock Baby Mario in Mario Kart DS. He is only in
Mario kart: Double Dash!!! and Mario Kart Wii.
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Yes it is since Mario Kart Double Dash is a Mario Kart game
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There are currently 8 Mario Kart games:Super Mario Kart (SNES) Mario Kart 64 (N64) Mario Kart Double Dash (GC) Mario Kart Wii (Wii) Mario Kart DS (DS) Mario Kart Arcade GP (Arcade) Mario Kart Arcade GP 2 (Arcade) (Japan only) Mario Kart Super Circuit (GBA)
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No, but in Mario Kart 7, you can customize it.
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No. Mario Kart 7 is ONLY for the 3DS. Mario Kart Wii is not the
same thing as Mario Kart 7.