Javelin Knight

Javelin Knight is the rarer of the Meta-Knights, with few appearances per game. It is a mechanical enemy, a special trait among the Meta-Knights, that resembles a purple and blue droid. It has a round body, with four segments rotating around its lower body. In the middle of its body is a slit, where the eye can be seen. It serves under Meta Knight.

Kirby's Adventure and Kirby: Nightmare in Dream Land
The Javelin Knight appears alongside the other Meta-Knights as a recurring mini-boss. Once Kirby enters the room, Meta Knight gives the command before leaving, and the enemies appear. Javelin Knight's behavior differs from the others, as its hops around the room, firing a javelin every once in a while. Occasionally, once it spawns, it will glide around the room, dangerously swinging a javelin around at a quick pace. As it does this, it is more difficult to attack it with a close range attack, and Kirby is most likely to get hurt.

Kirby Super Star and Kirby Super Star Ultra
The Javelin Knight sports the same appearance and behavior as previously, though it appears at will, not requiring the command of Meta Knight. Additionally, its javelin swing has it open up the segment between its head and body, swinging more javelins around at once. It can also be summoned by Galacta Knight, sporting a more ghastly color scheme.

Trivia

 * The earlier artwork of Javelin Knight has some resemblence to a Stormtrooper helmet from Star Wars.
 * Javelin Knight is the weakest of the Meta Knights, but he makes up for it by being the only Meta Knight to fly.