A Luminar is a fiery alien creature from the Animorphs series. It inhabits one of the moons of Sleegab Five.
It is seven feet tall and has a bulbous humanoid body. It has two short legs and two short arms with sausage-like fingers at the end. It has a wide smile that crackles with electricity. Its skin is able to emanate heat and is capable of incinerating anything it touches, but when it comes in contact with water, it loses its fire and it just has regular flesh.
Visser Three morphs this creature in Book #36: The Mutation.