Hideyoshi Hata works as a police coroner with grey hair, grey eyes, and an aged appearance. He specializes in autopsies but exhibits an unsettling fascination with the deceased, having entirely abandoned interest in living people. Hata openly expresses specific curiosity about Yakumo Saitou, desiring to perform his autopsy.

His eccentric behavior treats autopsies as a source of amusement and personal satisfaction, approaching them like a hobby. This preoccupation extends to daily activities: during meals, he dissects the anatomical origins of meat aloud, routinely unnerving companions and ruining their appetites. He also maintains a personal kidney collection, underscoring his macabre interests.

Though colleagues find his demeanor and habits repellent, Hata’s extensive forensic knowledge makes him indispensable to investigations. He remains a key resource for the police investigative team whenever pathological expertise is required.