Information about Meta Knight in the video games he appears in. Spoilers ahead.

Kirby's Adventure
Kirby's Avalanche
Kirby Super Star
Kaabii no Kirakira Kizzu
Kirby Air Ride
Kirby's Epic Yarn
Kirby Return to Dreamland
Kirby Nightmare in Dreamland
Kirby and the Amazing Mirror
Kirby Canvas Curse
Kirby Squeak Squad
Kirby Super Star Ultra
Super Smash Bros. Melee
Super Smash Bros. Brawl