Lilith

Background
Lilith is a powerful demon and Lucifer's second-in-command. She was the very first human to be turned into a demon. In fact, she was the very first demon that Lucifer ever created after Michael cast him out of Heaven and was thrown into Hell. Lucifer twisted and warped her soul as a way to mock God's most beloved creations. She is feared and ruthless. Though, she prefers her hosts to be young girls, she's been known to possess beautiful women in order to fool or seduce men. As she was the first demon created, she therefore became the final seal to release Lucifer from his prison in Hell.

Season 3
In "Jus In Bello", it is revealed by Ruby that Lilith is the one that sent a horde of thirty demons to kill the Winchester brothers after they are captured by Special Agent Victor Henricksen and being held in the local sheriff's office. Ruby further explains that Lilith is more interested in killing Sam due to the fact that she sees him as competition. After the Winchester brothers successfully defeat the horde of demons and Henrickson lets them go, Lilith makes her first appearance. She arrives at the sheriff's office possessing a little girl accompanied by an adult woman, most likely possessed by a demon. Lilith walks over to Nancy Fitzgerald, the secretary of the sheriff's office, and tells her that she's looking for two boys and that they're brothers, "one's really tall" and "one's really cute". Nancy asks what Lilith's name is. Lilith tells her that her name is Lilith and then reveals her white demonic eyes. Before, Nancy, Henrickson, or the deputy could do anything, Lilith raises her hand releasing a burst of white energy causing everyone in the sheriff's office to scream in agony. Later on, Ruby has the Winchester brothers turn on the news to see that Lilith not only killed everyone in the sheriff's office but also blew up the building as well.

Relationships

 * Lucifer (Creator, Leader)


 * Crowley (Demonic Brother; Second-in-Command; Lover)


 * Demons (Siblings; Subordinates)

Powers
Lilith, being white-eyed demon, is extremely powerful. She was one of the two whited-eyed demons that the Winchester brothers had ever seen, the other being Alastair. Due to her being the first demon ever created by Lucifer she may have been the most powerful demon in existence until her demise at the hands of Sam. She has shown the following powers:
 * Demonic Possession


 * Telekinesis
 * White Energy Blasts


 * Grant Wishes

Season 3

 * "Jus In Bello"
 * "No Rest for the Wicked"

Season 4

 * "Yellow Fever"
 * "The Monster at the End of This Book"
 * "Lucifer Rising"