Fighter

"Go for it! CHAMPION"

- Fighter's Flavour Text

Fighter is One of Kirby's Copy abilities.

In this form, Kirby gains the abilities of a martial artist and boxer, along with being able to fire energy blasts like stereotypical chi/aura fighters, and shows it all off while topped with a red headband. The Headband is identical to the one Kirby used for the Backdrop Ability in Kirby: Nightmare in Dreamland.

In the Super Smash Bros Series
Some of Fighter's attacks are used as part of Kirby's regular attacks, in particular the Vulcan Jab and the Spin Kick. Fighter is one of the three Copy abilities turned into a Trophy in Super Smash Bros. Melee, the others being Fire and Ball. Fighter will Once again be a Trophy in Super Smash Bros. Brawl.

Captain Falcon also uses a moveset simliar to Fighter's abilities, posibly inspired by them.

Knuckle Joe also uses these moves in Super Smash Bros. Brawl

Kirby: Right Back At Ya!
The Fighter ability in the anime is most like the version in Super Star. The look of it is the same, with a simple red headband. Kirby uses all of the same attacks as the Super Star version at some point in the series. One notable thing is that all of the attacks also depicted as firing off bursts of energy, possibly in a reference to various Shoun anime where characters had that ability.

He most often gets the ability in episodes featuring Knuckle Joe, from inhaling one of the boy fighter's attacks. Fighter is one of his strongest abilities, used against powerful demon beasts like Masher, with the strongest attack being the Rising Break.

Fighter Kirby's abilities are best displayed in episode 53, where he participates in a Battle Royal against five different fighters:a kung fu guy,a boxer,a karate expert,an old martial master,and a sumo wrestler using a variety of moves.

In the transformation sequence, a lightband forms into the headband. It comes off his head,but he catches it.

Transformation Sequence
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Trivia

 * The red headband Kirby wears for this ability is said to be a homage to the Street Fighter character, Ryu, though it has been neither confirmed nor denied. Some say an even bigger reference to the series is that Fighter Kirby can fire energy blasts or "Hadouken".
 * If Red Kirby obtained Fighter, he would get a white headband.