Luminar (Animorphs)

A Luminar is a fiery alien creature which inhabits one of the moons of Sleegab Five.

Biology
It is seven feet tall (~ 2.1 m) 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 incinerate anything it touches, but when it comes in contact with water, it loses its fire and it just has regular flesh.