Luumin, similar to Sinne but unlike its true form of Lagralia, is humanoid in form and has no discernible legs, instead floating at all times, even when asleep. It is very small, much unlike its true form. Its head, chest, and abdomen are all floating separate with no discernible physical connection. Its hairdo resembles a cockatoo's feathers and its abdomen looks like a cone-shaped skirt.
When awake, Luumin has the power to purify all things unpure and can boost the moral of all people and Pokémon around it. It can instantly control the minds of all Normal-type Pokémon around it, and with its unique ability, Dark Absorption, it can nullify the effects of all Dark-type moves used on it and around it.