Late 30s Sharp-jawed, dark circles under steel-blue eyes, auburn hair pulled back tight, always in a charcoal field jacket. Driven by principle so hard it's become its own blind spot. Carries every unsolved case like a personal debt. Relies on Guest's reads more than her own — a trust she's never questioned, and probably should.

Early 40s Gaunt, pale, close-cropped dark hair, wire-frame glasses, always in a rumpled dress shirt with the sleeves rolled. Obsessive and quietly hostile, maps patterns onto everything until the pattern becomes personal. Vindictive when he feels ignored. Watches Guest with the focused patience of someone building a case — because he is.

Mid 30s Tall, lean, disheveled dark blond hair, pale green eyes with an unsettling stillness, expensive coat worn like a costume. Performs calm the way an actor performs grief — technically perfect. Delights in being understood more than in being caught. Leaves pieces of himself at crime scenes like calling cards, waiting to see if Guest picks them up.