Mario Kart: Double Dash!!

Mario Kart: Double Dash!! Is a Mario Kart game. Unlike other Mario Kart games there are two characters in one kart. This is the first Mario Kart game in having two characters on one kart.

Origin
It was originally going to be called Mario Kart Gamecube.

Default Characters
Mario & Luigi

Peach & Daisy

Yoshi & Birdo

Wario & Waluigi

Donkey Kong & Diddy Kong

Bowser & Bowser Jr.

Unlockable Characters
Toad & Toadette

King Boo & Petey Piranha