Koopa the Quick is a large Koopa that Mario races against in Super Mario 64. He will race you on the second mission at Bob-omb Battlefield and at the Huge section of Tiny-Huge Island. The aforementioned place, he claims to be his home course. He will give Mario a Power Star if he wins.
He also appears in Mario 64 DS, Where he will again only race mario. Not much has changed from him exept graphics.
There is a glitch in the before-mentioned mission that allows the player to beat Koopa the Quick in 0 seconds. To do it, the player must get the Wing Cap and triple jump right in front of Koopa the Quick, but not too close. Then fly to the top of the mountain. Koopa the Quick will talk to Mario once he lands, though he is far away. Then the timer begins and ends at zero seconds. However Koopa the Quick never gets up there, so the star can't be obtained that way.
Hey, Mario! It is true that you beat the the Big Bob-omb? Cool! You must be strong. And pretty fast. So, how fast are you, anyway? Fast enough to beat me... Koopa the quick? I don't think so. just try me. How about a race to the mountaintop, where the big bomb-omb was? Waddya say? When i say GO let the race begin!