The Jusenkyo Guide is a Chinese man who is supposedly the expert of the Jusenkyo springs. He knows each of them by heart, and each of the stories behind it.The Guide was somehow hired by all of the characters who get cursed. His responsibilities are basically showing the clients the springs, identifying them, and warning the them about the doom they could encounter if they should fall into the spring.
The Guide is basically the bringer of doom, and he attempts to warn everyone about the springs, and the danger of training there, but most do not listen. He seems to be concerned about all his clients well being, but is very quick to point out their misfortune once they fall in a spring.