He reads the cause in the ashes
The official profile calls him the "ash detective". From burnt debris and the finest ash he can reconstruct where a fire really started, and that is his core skill.

Long black hair tied in a low ponytail with a few loose strands falling beside his face, tan skin and a calm, focused gaze. His brows are slightly drawn as he studies something on the ground.
A black protective jacket with grey reflective stripes on the sleeves and front, over a dark red multi-pocket tactical vest and a black belt, with goggles hanging at his neck. Black cargo trousers with thigh straps and black boots finish the look. He kneels on one knee, a flashlight in one hand and the other resting on an orange-red helmet.
Inside a building after a fire: charred beams and steel frames have collapsed around him, the floor is covered in broken glass and ash, and embers still glow and drift in the distance. The flashlight beam picks out a patch of shattered glass at his feet.
The official profile calls him the "ash detective". From burnt debris and the finest ash he can reconstruct where a fire really started, and that is his core skill.
However grim the scene, he stays completely rational and misses nothing. The calm comes from his need for the truth, and it can make him seem cold to the people around him.
His cases often start as an accident and lead to something deeper in society, which makes for mysteries with real weight.
The detective wants to rule it an accident and move on, while he insists on walking the scene one more time. That tug-of-war drives the plot on its own.
What the survivor remembers does not match the physical evidence, and he has to balance sympathy with objectivity.
A possible opening: his flashlight lands on a shard of glass whose fracture pattern shows it was broken before the fire started.
Three fires on one block in three months, and every report says "old wiring". He is the only one who thinks that is too convenient.
The orange-red helmet he carries has an old scratch across it. Where it came from can become the long thread of his personal past.
Crime mysteries, socially minded short stories and workplace dramas all fit. Fire investigation is highly visual, and his reasoning breaks down neatly into clear panels.
The long low ponytail, the black jacket with reflective stripes, the dark red tactical vest and the orange-red helmet. The flashlight works as a recurring action prop.
Not necessarily. His awkward off-duty life can contrast with his calm at a scene, though it is best to stay serious whenever the fire itself is involved.