Paimon is King of the Ars Goetia and amsent father of Princes Stolas.
Paimon has been shown to be a negligent father, who cannot recall his son's name without the help of his butler. He is a self-absorbed, inconsiderate and callous individual. When he made a child Stolas caretaker of the grimoire, he half-heartedly followed up by informing his son about the latter's arranged marriage to Stella, failing to consider, or care, about his son's opinion on the matter.
His disinterest in attending to his son's care is further emphasized when he dismisses his son's distress as "bitch crying", before forcing his son to attend a circus event with the expectation that it would calm him down. Even in this regard, he failed to actually physically accompany his son, opting to have his butler carry a magical mirror that allowed him to observe the event remotely. He would later go on to congratulate himself for being "so good at daddying” in regards to his treatment of Stolas.
Paimon upholds his status from being part of the Ars Goetia, looking down on those who are beneath his station. As seen when he slaps Stolas on the head and scolds the latter for bowing down to an imp when introducing himself, and his lack of consideration for the damage his rampant teleporting would cause the tent's for a circus.
Despite his poor parenting skills, Paimon has been shown to be a keen observer. He was able to quickly identify that his son was seemingly fond of a certain child imp circus performer, and took measures to have the aforementioned imp accompany his son to cheer him up. Though, the measures he took to hire the imp, offering to buy him for $5 and a slim-fit condom, further emphasize his deprecation of lower caste demons.
Abilities
Immortality - As demonic royalty and father to Stolas, who is mentioned to be immortal, Paimon is biologically immortal, presumably being able to live for a long period of time and only able to be killed by angelic weaponry.
Shapeshifting - When he is first introduced, Paimon is seen transforming into several silhouettes of demonic creatures that include a goat, a four-headed snake, an elephant, and a winged eyeball (resembling the biblical Ophanim) before getting up from his throne.
Teleportation - Paimon was able to teleport his mirror self and Mister Butler away from Cash Buckzo's circus while leaving a flaming crater behind.
Grimoire manipulation - Paimon showcases the ability to summon forth the grimoire he later gifts Stolas.
Projection - Paimon is seen casting lifelike projections while imparting cosmic knowledge onto Stolas.