These are warriors that are recruited into Meta Knight's forces.
“Lt. Ferdinand Roman MeisoNato, known in canon as "Mace Knight", is a Meta-Knight. Not only this...Mace Knight
“Lt. Axel Theodore AkkusuNaito, known more commonly as "Ax Knight", is a Meta-Knight. Even more...Ax Knight
“Cdre. Oberon Zach Deeseil, more commonly known as Sailor Waddle Dee, is a high-ranking...Sailor Waddle Dee
“Blade knight is a recurring enemy in the Kirby games. It resembles, obviously, a knight wielding...Blade Knight