According to the writings in The Lesser Key of Solomon, Paimon is the ninth spirit listed in the Goetia. He is a King of Hell ruling over the northwest with two hundred legions of demons under his command. He is noted to be especially loyal and obedient to Lucifer, far more than the other kings. He is depicted as a man with an effeminate face, wearing a jeweled crown and riding a dromedary camel.
He is often surrounded by his courtiers who play many musical instruments and speaks in a booming voice until the conjurer requests him to speak clearly. When summoned, unless he is first able to ask the conjurer what he wants and receive a clear answer, Paimon will not do their bidding. He is able to teach all sciences, arts and philosophy as well as speak of all the mysteries of the Earth, wind and water. He gives good familiars and can bestow and confirm dignities. He can also force any man to do the will of the conjurer.
"One of the 72 demons of the Goetia, he is called the "King of Dominions", and is depicted as a man with a woman's face, wearing a crown of jewels and riding a camel with a single hump. He is knowledgeable in the sciences, arts, and secrets, and can share that information in an instant, causing those who have gained his help to no longer put forth effort."
Paimon attacks Mirai Kaname in Red Book to assassinate her in her master Lucifer's name. However, Veil takes a hit for her which makes Paimon decide to spare her for now out of honor of her demon partner taking a hit for her. She can later be recruited in the Pyramid.