First S

Detective S is the classmate of Detective R. He is an intergalactic Chronarch student detective from Kakushin. He travelled to Rikapan to solve crimes with R. His real name is Sherrinford Jyohoku.

Personality
S is known for being very thick, yet sometimes he can be quite intelligent. S is goofy and unpredictable; a wild card.

Appearance
In Detective R: The Case of the Missing Black Jewel, Inspector Fangs described S's hair as a "funny banana hair".