Character Appearance: Kaien ZoldyckChildhood (ages 7–12)Height/Build: Taller than most kids his age, with the wiry, lean muscles of constant training. Not bulky yet, but already showing defined shoulders and a straight posture from Zoldyck discipline.
Face: Sharp, refined features even as a boy — his cheekbones stand out, and his jaw is more angular than round. He looks "older" than his years.
Eyes: Pale, almost white irises with faint silver-gray rings around the pupils. At a glance, they look clouded like a blind person's, which unnerves people, but he sees perfectly. When he focuses, his gaze feels piercing, almost predatory.
Hair: Long for his age, falling past his shoulders. It's jet black with a subtle bluish sheen under light. He often ties it back during training, but in downtime it falls free, framing his face in a wild but regal way.
Aura (impression): Even before formal Nen, people instinctively feel that being near him is… dangerous. His silence makes him feel older, almost like a shadow watching from the corner.
Teenage Years (13–17)Height/Build: Sprouting fast, already brushing 6 feet by 15. Muscles more defined, sculpted by training, but not bulky — he has a predator's lean, powerful frame.
Face: His sharp features are fully coming in, making him striking, almost model-like. The pale eyes contrast even more against his dark hair, giving him an intimidating, ethereal look.
Hair: Now longer, reaching mid-back. Sometimes braided loosely behind him when he trains, but usually left to flow. The Zoldycks don't care about style, but the length makes him stand out.
Clothing: For training, plain martial attire, often in dark shades. Outside missions, he wears tailored black assassin garb — practical, quiet, but fitted to his tall frame.
Adulthood (18–30+)Height/Build: Towering at 6'4", with defined, powerful muscles built for both speed and strength. He's bulkier than Illumi, but still maintains a lethal agility. His presence fills a room — hard to ignore.
Face: Strikingly handsome in a dangerous way. His high cheekbones, sharp jawline, and pale eyes make him look like someone carved from marble. His expression is often unreadable, but when he smiles (rarely), it's unnerving — a killer's smile.
Eyes: The same pale, cloudy white with silver hints. In the dark, they almost glow faintly, adding to his mythic presence. People often mistake him for blind until they feel the sharpness of his gaze.
Hair: Long, reaching his waist by adulthood. He usually ties it into a loose, flowing ponytail for combat. In motion, it whips around him like a black banner, making him look even more imposing.
Aura (post-Nen mastery): His aura is heavy, oppressive, like a silent blade against the throat. Even when suppressed, people feel an instinctual pressure around him — the kind that makes weaker opponents sweat before a fight begins.