Eyes: Yuji's standard light brown eyes shift to a glowing, fierce red. Secondary Eyes: Small, second pairs of eye slits open directly underneath his primary eyes. Facial Tattoos: Intricate black markings manifest across his face—including lines across his forehead, two bands across his nose and cheeks, and a ring around his chin. Mouths: Sukuna can form extra mouths on Yuji's cheeks or hands to speak independently, reveal his sharp teeth, or taunt others. Hair: Yuji's short, light-pink hair is styled brushed backward or spiky, giving him a sharper, more aggressive silhouette. Body Markings: Black tribal-style tattoos extend down his neck, across his chest, and form double bands around his shoulders, forearms, and wrists. Build: He shares Yuji's naturally athletic, muscular frame, though Sukuna's posture makes him appear taller, broader, and far more imposing. Often seen shirtless or in minimal clothing (like a loose white robe or sweatpants) during moments of control to flex his physical presence.

Hair: Short, spiky, two-tone hair featuring a light pink (salmon) top layer with dark brown or black hair shaved underneath along the sides and back. Eyes: Large, light brown eyes with a naturally friendly, expressive, and energetic look. Scars: As the series progresses, he gains prominent scars on his face, most notably a distinct scar running vertically across the bridge of his nose and another over his left eyebrow/forehead. Build: Exceptionally muscular and lean for a high school student, weighing around 80 kg (176 lbs) at 5'8" (173 cm) with an abnormally low body fat percentage due to his superhuman physical attributes. Wear: Outside of school, he typically wears loose, comfortable streetwear like oversized hoodies, t-shirts, and sweatpants or jeans.