The element Light. Beings of light are often beautiful to look at, ornate and perhaps esoteric. This does not automatically dispose them to being good-aligned (i.e. Satan, whose angel name was Lucifer, or "Light-Bearer"), but it does usually imply a knowledge of the supernatural.
EX: Fairies are beings of light. They are sparkly and beautiful, with a notoriously odd nature. They are quirky, and have no qualms about revealing their magic. Magic abilities are common, and are often manifested as some form of light.