Gaspar's appearance varies from game to game, but consists of the same overarching appearance: a limbless, blushing ghost in a nightcap. In its debut, Kirby's Dream Land, it was pale white and wore a red nightcap. In Kirby's Dream Course, Gaspar's design was edited and refined. This design, which stands as its current design, is a creamy shade of yellow, and a dark blue nightcap with a neon green trim.
Gaspar serves as the equivalent of Booler in the Extra Game of Kirby's Dream Land. Gaspar lives in Castle Lololo where he floats around just like Booler, but at a higher speed, and usually in a set pattern. It is stronger than its counterpart, dealing two points of damage when it collides with Kirby. The enemy has the tendency to wiggle its tail around as it floats around.
Gaspar is one of the few enemies that required to be hit with a high-angled shot in order to be defeated.
- Gaspar's name may be a reference to Casper the Friendly Ghost. Alternatively it may be derived from the word gasp.
- Prior to the release of Kirby's Dream Land, "Gaspar" or "Gasper" was one of the alternate names that Nintendo of America suggested to HAL in place of "Twinkle Popo," the name that HAL originally proposed for the character that became Kirby. Source
- In Pokémon Diamond, Pearl, and Platinum, a girl in a house in Snowpoint City will trade the player a Haunter nicknamed Gaspar for a Medicham.