The Jusenkyo Guide works at Jusenkyo and usually warns anyone that comes there that they should not train there or they will fall under a grave curse. He knows the names of the hundreds of pools through the area, when they became cursed, and the "tragic story" behind each of them.
The Guide also has a daughter, named Plum. He is always very helpful to anyone that comes and visits, and tries to offer whatever help he can.
The Guide is also in charge of the guest registry that Pantyhose later uses to track down all the victims of the Jusenkyo curses.
Koichi Yamadera & Ian Corlett
Koichi Yamadera is the famous voice behind the Guide. He also voices Ryoga Hibiki on Ranma ½ as well as Spike Spiegel on Cowboy Bebop, Togusa in Ghost in the Shell, and Yuta in Mermaid Forest and Mermaid's Scar.
Ian Corlett provides the Guide's English voice for the majority of the series. He also plays Dr. Tofu as well. His other roles include Goku in Dragon Ball Z and Hikari Daitokuji in Project A-ko. Ian left the series towards the end and was replaced in this role by Michael Donovan (Ryoga Hibiki).