You can get brown Kirby by defeating drag race 2 with the wing star under 29 seconds
It's the bulk star. You can unlock it in air ride by doing celestial valley in time attack under 3 minutes and 32 seconds
On Sky Sands get a lap time under 1'05'00 with Bulk Star.
Warpstar Compact Star Slick Star Winged Sta Formula Star Shadow Star Swerve Star Rocket Star Wagon Star Turbo Star Jet Star Bulk Star Wheelie Bike Wheelie Scooter Rex Wheelie Dragon, Hydra FlightWarp Star
Yes besides them King Dedede and Meta Knight appear as playable characters as well as other air rides like the Swerve Star and Jet Star just to name some.
You unlock all of the bloopers after you beat the True Arena.
2022Kirby's Dream Land (1992) Kirby's Adventure (1993) Kirby's Pinball Land (1993) Kirby's Dream Course (1994) Kirby's Avalanche (1995) Kirby's Dream Land 2 (1995) Kirby's Block Ball (1995) Kirby's Toy Box (1996) Kirby Super Star (1996) Kirby's Star Stacker (1997) Kirby's Dreamland 3 (1997) Kirby Super Star Stacker (1997) Kirby 64: The Crystal Shards (2000) Kirby Tilt n' Tumble (2001) Kirby: Nightmare in Dreamland (2002) Kirby: Air Ride (2003) Kirby and the Amazing Mirror (2004) Source: Kirby Wiki This list does not include the Super Smash Bros. games.
By beating all 19 foes of the Arena
you have to beat at least 13 bosses in The Arena
Marx from Kirby Super Star was named after German philosopher Karl Marx.
To unlock Revenge of Meta Knight, you must beat Dyna Blade.
In Kirby's Adventure,Kirby Super Star,Kirby Squeak Squad and in Kirby Super Star Ultra yes.