From Kirbypedia

Name:	Mirror
First Game:	Kirby Super Star
Enemies Copied from:	Simirror
Helper:	Simirror
Anime Episode(s)	054, 070

One of Kirby's Copy abilities.

Kirby gains the ability to create mirror images of himself to confuse enemies and perform multiple attacks at once. Mirror Kirby wears a red and green dual-toned hat (very similar to the one worn by Beam Kirby), and a blue-tipped scepter with which he performs attacks.

Games

Kirby Super Star

Kirby gains a few offensive moves as mirror Kirby, and his defense capabilities are increased.

• Mirror Cut - Kirby performs a quick downward strike with his scepter. (It should be noted that he cannot actually cut ropes with this move).
• Reflect Force - Kirby sends out multiple mirror-like objects in front of him while waving his scepter, attacking enemies ahead of him and reflecting attacks.
• Mirror Body - Attacking while dashing makes Kirby split into two, attacking enemies from a distance. If he attacks in midair, he'll split diagonally.
• Reflect Guard - An improved version of Kirby's regular guard, Kirby can protect himself without sustaining any damage. If he's hit with projectiles, they'll be reflected and attack the enemy that threw them.

Anime

Despite the popularity of this ability, so far this and KSS are the only places it has appeared. Naturally, the ability is mostly unchanged from the game version, including the same hat.

The attacks Kirby uses are Reflect Guard, Mirror Copy and Mirror Cut. When he uses Reflect Guard, he gains a translucent rainbow-colored force shield.

Mirror Copy is greatly updated- instead of only two, Kirby creates dozens and dozens of copies, all of which can harm the enemy.

His most powerful is the Mirror Cut, where his scepter turns into a shimmering sword that he'll use to cut the enemy in two.

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