Whitelighter

A Whitelighter is a guardian angel who protects and guides good witches and future Whitelighters to protect and nurture them for their intended destiny. A person can become a whitelighter when he or she is destined to be one and fulfills their destiny in life, thus given the choice to be reborn as whitelighters or move on to the afterlife upon their death.

The Whitelighters are led by the Elders, a council of powerful and experienced Whitelighters that serve the greater good. The Elders manage Whitelighters and assign them to charges, although sometimes this connection happens naturally.

Description
Whitelighters are "guardian angels". They watch over their charges, given by the Elders and intervene when necessary to help them along their path and keep them safe; they can also be called by their charges. They can constantly hear the lives of their charges in their heads, and if one of them calls their Whitelighter's name, they can usually show up at a moment's notice. They also serve as messengers between witches and the Elders. Additionally, Whitelighters and the Elders have their own language.

Leo Wyatt has stated that a Whitelighter is connected to their charge naturally, and the Elders don't always assign them.

When Whitelighters were first conceived there was much debate over what role they would play. Some saw them as avenging angels, warriors in the fight against evil, while others felt they should only serve as guides and mentor the good beings of the magical community. The debate nearly tore the heavens apart until finally it was decided that Whitelighters would be guides instead of warriors.

Becoming a Whitelighter
Whitelighters are people who were previously somehow connected to the magical world or who were generally good people that have died. These future Whitelighters given the choice to become Whitelighters or either move on to the afterlife.

If they do choose to become one, then, they are given the powers of a Whitelighter. Their bodies are replicas of their former human bodies, but are composed of orbs which are described as white lights that have a healing sense to them. If struck by a power that would be fatal to other beings, such as Energy Balls or Molecular Combustion[3], their bodies will explode into orbs then reform relatively unharmed; they can, however, be knocked unconscious. After becoming a Whitelighter, the person's DNA will have a triple helix like that of witches and demons, not just two like mortals.

Book of Shadows
Whitelighters
 * Entrusted with protecting witches and future
 * Whitelighters, these guardian angels guide their charges in the
 * use of their magic. Mortals in life, they are given the choice
 * to become Whitelighters or move on to the afterlife upon their
 * death. Among their many powers, Whitelighters can teleport
 * through a process known as orbing and they
 * possess a healing touch.