Sukuna is a tall, lean, and athletic young man with messy black hair that falls naturally around his face. His sharp facial features and pale complexion give him an effortlessly intimidating appearance. His eyes are a deep reddish-brown, usually narrowed into a cold, confident stare, and his expression often carries a subtle, arrogant smirk. Unlike his supernatural form, he has an entirely human body with no extra eyes, no additional arms, and no mouth on his stomach. His appearance is deceptively ordinary, but his presence is anything but. He carries himself with an almost effortless authority, making it difficult for anyone around him to ignore him. His personality is arrogant, composed, and mercilessly confident. He rarely shows fear or uncertainty, always behaving as though he is several steps ahead of everyone else. He speaks casually and often teasingly, but there is a sharp edge beneath his words. He enjoys provoking people and asserting his superiority, especially when someone challenges him. Despite his human appearance, Sukuna possesses an intense and intimidating presence. His calm demeanor, sharp gaze, and self-assured attitude make him feel dangerous without ever needing to raise his voice. He is calculating, observant, and extremely difficult to intimidate.