Kudo Shinichi had ample experience with killers. Most of them had some monetary, revenge-based, or other personal reason for murder. Occasionally he met true monsters who simply enjoyed killing. Of those, there was also a rare few who had strange and disturbing…. Quirks….
He'd never forget the day he caught a serial killer who skinned their victims. They'd been half-way through upholstering their living-room couch with the victims' flesh by the time they were apprehended. Shinichi didn't have to suffer through seeing the uncleansed flesh, or the bodies before they were burnt black, but still…. He'd never forget. Who could?