There are 2 secret levels in every world. To get the first one, you must get a gold ranking on the Boss level (you do that by getting a bunch of gemstones during the fight). Then you get the 1st secret level, which you must beat to get the 2nd one.
You die
KO a kirby 5 times while on their air ride machines in city trail
You can get brown Kirby by defeating drag race 2 with the wing star under 29 seconds
Kirby starts as a playable character; you don't have to unlock him.
Chloe Kirby is 5' 5".
there's only 1 character: Kirby (unlocked by playing the game XD)
Kirby Gocke is 5' 5 1/2".
He's already unlocked, if you mean Super Smash Bros.
Waddle Dee is not an unlockable character in Kirby Air Ride instead they appear as stage obstacles.
Annie Kirby is 5' 4".
Joyce Kirby is 5' 1".
Laura Kirby is 5' 7".
Tracy Kirby is 5' 7".