From Kirbypedia

Name:	Missile
First Game:	Kirby's Adventure
Enemies Copied from:	Bang Bang, Bombar
Helper:	None
Anime Episode(s)	None

One of Kirby's Copy abilities. Kirby takes the form of a speeding missile and causes an explosion whenever his path is obstructed.

Kirby wears a simple red and blue cap when he's not in the actual missile form.

Games

Kirby & the Amazing Mirror

After copying missile, Kirby can change into a missile form whenever he wants. He can move freely, though with a large turning radius. If Kirby's path is obstructed by a wall or an enemy, he'll explode, and return to normal form. There is a long moment where Kirby will be uncontrollable, which can be a problem if he's falling over a pit.

Kirby Canvas Curse

Missile returns, though this time it's not as easy to come by. When Kirby acquires MIssile and is tapped, he once again assumes the form of a missile, though he moves slower than he did in Kirby & the Amazing Mirror. The missile will move in a straight line until its course is altered by ink from the Magic Paintbrush, or it hits a wall, in which case it will blow up and return Kirby to normal. (However it can go through enemies without stopping.)

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Kirby Copy Abilities:

Cupid - Animal - Backdrop - Ball - Balloon - Baton Twirling - Beam - Bomb - Bubble - Burning - Clean - Cook - Copy - Crash - Cutter - Fighter - Fire - Freeze - Galaxia - Ghost - Hammer - Hi-Jump - Ice - Iron - Jet - Laser - Light - Magic - Metal - Mike - Minimum - Missile - Mirror - Needle - Ninja - Paint - Parasol - Plasma - Sleep - Smash - Smash Bros. Abilities - Spark - Stone - Suplex - Sword - Throw - Top - Tornado - UFO - Water - Wheel - Wing - Yo-yo

Final Weapons:

Star Rod - Love-Love Stick - Rainbow Sword - Star Chariot - Master - Triple Star - Block