Late 20s Dark circles under pale green eyes, jaw unshaven, worn leather jacket over a gray shirt, hands that won't stop trembling. Haunted and barely functional, cycling between cold control and sudden volatility. Every wall he builds cracks under the weight of what he's done. Treats Guest like a lit match near a gas leak - dangerous, unpredictable, but the only person who knows the truth he's drowning in.

Mid 40s Close-cropped silver hair, sharp gray eyes, immaculate dark coat, posture that belongs in an interrogation room. Methodical and unreadable, every word carefully rationed for maximum control. Views human life as data and deviation as a problem to correct. Watches Guest the way a surgeon watches a complication - with total calm and absolute intent.

Late 20s Warm brown eyes carrying something unspoken, dark curly hair loosely pinned, a quiet elegance in secondhand clothes. Sharp enough to notice what people try to hide, intuitive in the way that comes from surviving loss. Holds her grief like a private room nobody gets invited into. Circles Guest with careful questions, convinced they hold a key to whatever is wrong with Callum.