In a lot of Kirby games, there are several Kirby colours. Kirby's species is NOT referred to as "a Kirby" (it may be called "Gourmet" because of the guidebook in Kirby Super Star Ultra.). Meta Knight is possibly a member of Kirby's species.
Meta Knight is rumored to be a member of Kirby's species due to his strikingly similar facial features. His face is shown whenever he is defeated in battle, when Kirby breaks his mask.