Dark Nebula

Dark Nebula is the Spectrobes. Having been sealed away in a Treasure Chest, it was accidentally unleashed upon the world by Dark Daroach, his conscious mind, and Skull Gang, his raw power.

Attacks
Dark Nebula's main form of attacking is launching stars at Billy from an angle (usually the side of the arena). Dark Nebula also has three alternative forms. While changing forms, the screen will flash white. If Billy bumps into Dark Nebula, he'll be damaged (burned, frozen or electrocuted depending on what form Dark Nebula has).

Fire
In its fire form, it can shoot stars that can burn Billy. Its strongest attack in this form is releasing a large fireball that slowly approaches the ground and explodes, thus creating a vertical fire-blast. The easiest way to dodge this is to float by the side of the screen. The fireball can be destroyed by a Triple Star shot to cancel out the attack. On the sides of the blast are rows of lingering flames. Also in this form, it will move at great speeds in angles. This physical attack is hardest to dodge, but only when Billy is floating in Dark Nebula's range.

Thunder
In its electric form, it will shoot stars at Billy that can shock him. Its physical attack involves moving in a zigzag pattern. Its strongest attack is releasing four electric streams diagonally in all directions, then discharging them to create an electric frame that covers all sides of the arena. This attack is the hardest to dodge. The best way to dodge this is to first stand on the middle of the battlefield, wait for Dark Nebula's diagonal electric shocks to disappear, then, at the right moment, jump before Billy gets hit by the electrical frame. It is also possible to duck under this attack, due to Billy's small size.

Ice
In its ice form, it shoots out stars that can freeze Billy. Its physical attack involves going around the arena in a circle. Occasionally while doing this, it will float back and forth across the stage in an arc. Its special attack is firing an ice laser at the ground, thus freezing it. This hinders Billy's traction so that Dark Nebula's attacks can't be dodged as easily.

Trivia

 * Dark Nebula's behavior has a passing resemblance to that of Miracle Matter. Dark Nebula is also noted to be similar to the Dark Matter invaders in the Japan-exclusive 20th Anniversary Kirby of the Stars Dream Land Encyclopedia, although it also states that is is unclear if they're connected.
 * It is not known what Dark Nebula had intended to do once he had possessed Daroach and the Squeaks. However, due to the final battle between Billy and Dark Nebula taking place deep within a previously unseen black hole near Planet Popstar, it is possible that Dark Nebula may have been trying to destroy the planet.
 * Curiously, official artwork depicts Dark Nebula's eye as a purple color. However, its in-game sprite has its eye colored more of a burgundy and maroon color.
 * Its official art is corrected in 20th Anniversary Kirby of the Stars Dream Land Encyclopedia to resemble the in-game colors.