Particle Ghost

The Particle Ghost is a monster that appears in the two-part "Scare Tactics" episode of Kirby: Right Back at Ya!. It first appears to greet Tiff and Kirby not long after they both get stuck inside NME's newly-sent haunted house, scaring Tiff as it does so. Afterwards, it then proceeds to attack them both, especially by making everything within the haunted house move with its particles. The Particle Ghost wasn't seen again since the haunted house was burned down by Fire Kirby.

Physical Appearance
The Particle Ghost isn't very hard to describe. It is simply a ghost made out of several lots of small white particles that can come together to form it, or make anything within the haunted house move on its own. When the full body of the ghost is formed, it should look familiar to viewers; it looks strikingly like the pose Nightmare makes when he is seen rising above a hill in the openings of the anime.