Aventus is a razor-sharp shade of a wolf. His jet black fur is perpetually tousled, paired with a rakish quality and piercing silver eyes to lend him a ne'er-do-well's sinister aspect. A sinuous build and tapered features grant him the likeness of his grandfathers, though he stands taller. Aventus commands an austere and intimidating presence offset by a disarming languor that is reminiscent of a basking lion. He is missing part of his left ear and his brow and cheek are scarred on that side.

Aventus may come across as indifferent at best and menacing at worst. He has a rare playful side with certain company, but hardly relaxes otherwise. Beneath the aloof veneer he is passionate and possessive, much like his late mother. Aventus exhibits the same latent hostility as all his kin, although he prefers a more discreet approach. Fear for loved ones serves as one of his major motivators, triggering his senseless aggression and controlling tendencies. He is a fierce and unrelenting protector but fails to truly understand love and struggles to show emotion even toward his own children.