Asmodeus, better known as Ozzie, is a supporting character in Helluva Boss who made his debut in the episode "Ozzie's". He is one of the Seven Deadly Sins, embodying the sin of Lust.

He is the owner of the dinner theater restaurant Ozzie's, as well as a factory for producing all manner of sex toys, which are both located in the Lust Ring where he works with his boyfriend and business partner Fizzarolli.

Asmodeus is a large, vibrantly-colored, and burly demon of intimidating stature. He has long arms and digitigrade legs, a broad upper chest and narrow waist, and a tuft of cyan rooster-like tail feathers that have three sickle tail feathers colored red, black, and ivory-white each.

His head is colored dark blue with red and white head feathers sticking out from tufts on his head, and he has large feathers running to his chest. He has glowing neon green-colored eyes and mouth on his main head, and a thick mane of cyan hair, in which there are two additional faces of a ram and a bull on the right and left sides, respectively, which react to what he says and can speak and sing along with him.

Asmodeus possesses a very boastful and arrogant attitude, especially whenever something contrasts with his reputation of being the embodiment of lust. Otherwise, Asmodeus values consensual lust, stating how it's about pleasure for everyone involved.

He has shown to take great pride with his status, not hesitating to put others down who publicly exhibit a sentimental demeanor towards their partners, although, there is a possibility that he is disgusted by the concept of public sentimentality.

He can also show sympathy towards others, as shown with Stolas in "Oops" when he sympathetically told him that he couldn't help him out of respect for Fizzaroli's wishes, despite wanting to. Unlike most of his fellow Sins, Asmodeus is also rather sympathetic towards the low-class demons, such as imps and hellhounds, even involving himself romantically with one. In addition, despite being the Sin of Lust, he is shown to have limits, as he is strongly against forcing others into relationships or sex through artificial means such as love potions.