Skills

Deal-making - Alastor is shown to be a deal-maker demon in the pilot, offering Charlie a deal in return for his help with the Hotel, something she wisely turns down.
Deal-maker demons like Alastor can increase their power by dealing in souls, which is a very powerful commodity in hell, so they're seen as very manipulative and not to be toyed with. Deal-making is not something every demon can do, as such it is not to be taken lightly as it doesn't generally work out well for the other party.

Soul Manipulation - Alastor is shown to have full control over the souls he owns, allowing him to command them however he pleases. He can also manifest chains on those he owns such as Husk in "Dad Beat Dad", and can tear their souls apart, which he broadcasts the screams to Hell.

Broadcasting - While living, Alastor's profession was as a radio show host, and he continues his broadcasts in Hell, ensuring that Hell's denizens are aware of his activities over the airwaves, earning him the title of "The Radio Demon".

Bilingualism - Alastor can speak English fluently as well as some broken Creole French.

Cooking - Alastor is noted to be "a big foodie" and mentions having admired his mother's cooking in the pilot, specifically her Jambalaya.

Musical, Dancing, and Theatrical Talent - Alastor is shown to display moderate vocal abilities and excels at dancing, with Vivziepop noting tap to be a style he excels in specifically. He also shows a flair for theatrical showmanship.

Wide Intellect- Alastor is shown to be quite a cunning individual, resulting in him accruing a large amount of power through his tricks and deal-making.