Sir Percival is a Star Warrior and member of the Galaxy Soldier Army who, along with Sir Lancelot and Sir Galahad, follows Sir Arthur. Just like the other three knights, he appears in the Kirby: Right Back at Ya! anime.
He has green skin, gray feet, a red mohawk, a V-shaped mask, and a similar cape to that of Meta Knight. His armor is grayish, and he carries a sword like Arthur and Dragato. Little else is known about him.