Sennosuke Shiratake works within the Kura organization as part of the Wellside team, specializing as a Times and Places Analyst. His role involves deducing and reporting critical intel on timeframes and locations by analyzing id wells—mental constructs built from the cognitive particles of serial killers or their victims. This analysis directly supports the Brilliant Detectives who enter these wells.

He possesses a relatively tall build and grey eyes, often seen behind matching glasses. His long black hair is typically tied back in a ponytail, with twin cowlicks prominently framing a large forehead. Shiratake favors a standard uniform of a black suit, coordinating waistcoat, light blue shirt, and darker blue tie. For formal events, he switches to a darker suit and waistcoat, pairing them with a white shirt and black tie.

One notable statement captures his view on detective work: "The brilliant detective doesn't actually have to arrest the criminal himself. He just needs to solve the case."