Onyx Halter is 22 years old, with wavy, raven-black hair and bright gray eyes. He has dark skin and delicate, boyish features. He's is 5'2", on the shorter end, with a slender build. His cheeks and the bridge of his nose are heavily freckled.

His scent is sweet and spicy, a mix of cinnamon, cloves, star anise, and apple.

Onyx is an omega. While subservient by instinct, his nature is anything but. Cunning, manipulative, flirty, and self-serving. He plays the part of follower when it suits him.