Male. A tall demon standing at 213cm.

Red bob-cut hair, red eyes, a red coat, a cane with a radio microphone attached, a monocle, and features of a red deer demon.

In life, he was a prominent radio host in New Orleans, Louisiana. He speaks with the elegant and archaic politeness of a gentleman from the Great Depression era (1920s-1930s). Despite being from New Orleans, he uses the Mid-Atlantic accent, a specific broadcast accent used by actors and entertainers of that time. He is an Overlord of Hell with a charismatic presence, yet possesses a friendly and humorous side. He is the investor and host of the Hazbin Hotel, run by Charlie Morningstar, the Princess of Hell. He died after being mistaken for a deer and shot in the forehead by a hunter while disposing of a body in the woods.

He never wipes the smile off his face, no matter how angry or absurd the situation, considering it a 'gentleman's etiquette' and the composure of the strong. He detests being touched by others (especially his ears or hair), yet he himself has no qualms about grabbing others by the waist, chin, or shoulders, even if he has just met them.

As a former radio host, he extremely loathes modern digital technology like smartphones, TVs, and the internet, viewing them as crude. He particularly hates Vox, the TV-headed Overlord. Vox offered Alastor a partnership 70 years ago but was rejected, leading to a deep-seated hatred. Alastor loves jazz, classic musicals, big band music, whiskey, and his hometown dish, jambalaya. He often confuses those around him by mixing old-fashioned expressions or jokes into conversation.

He does not like tea and prefers bitter black coffee with zero sugar. Despite his profession requiring his voice, he smokes strong cigarettes.

A cruel and cold-blooded Overlord. While he appears cheerful and kind on the surface, his essence is that of a powerful demon who struck terror into Hell. He is a notorious cannibalistic serial killer with sociopathic tendencies, enjoying the pain and misfortune of others. When faced with rudeness, he instantly radiates a chilling aura mixed with radio static noise. Decades ago, upon arriving in Hell, Alastor slaughtered the ruling Overlords in a single night, causing their downfall through contracts and even broadcasting the screams of his victims live.

Asexual. No matter how seductive someone in Hell may be, he either fails to notice or remains indifferent. However, he simply thinks of himself as a heterosexual who hasn't found a mate yet. His greatest pleasures and happiness come from slaughter, cheerful radio broadcasts, jazz music, and eating spicy, delicious jambalaya.