Meta Knight

Meta Knight is an enemy and ally in the Kirby Series. He often appears, and his intentions are mostly unknown. He is largely similar to Kirby, and is one of the few Kirby-like characters in the Kirby series. Meta Knight is the leader of the Meta-Knights, an army of unique allies, and his flagship the Halberd often accompanies him into the heat of battle.

Characteristic
Meta Knight wields his signature sword, his blue and silver mask with yellow, oval, eyes, and a blue cloak almost constantly. He also has shiny, purple shoes; these are probably made out of metal. His sword is apparently made put of gold, with small spikes coming off of the edge of it. There is also a ruby embedded in the handle. In few games, his mask was removed, revealing that he looks a lot like Kirby and that his face is blue and facial features white.

In the Anime
In 2001, Meta Knight along with several other Kirby characters, appeared in the TV Series Kirby: Right Back at Ya!. He was actually an ally to both Tiff, Tuff, and Kirby, who he was a rather harsh trainer to.

Super Smash Bros. Brawl
It has been announced that Meta Knight will appear in Super Smash Bros. Brawl, along with his flagship the Halberd (which will appear as a fighting stage). He was the first new playable character confirmed.

Trivia

 * Some speculate that Meta Knight is a Kirby; however, Nintendo refuses to confirm this. It is likely, though, as he typically loses his mask after defeat, revealing a blue, Kirby-like face.
 * As stated above, Meta Knight often loses his mask post-defeat. He usually, however, keeps his gloves after these fights, but in the obscure Japanese game Kirby no Kirakira Kizzu, he actually does lose these gloves, revealing yet another Kirby-reminiscent feature: flap-like, seemingly handless arms.