Yep, China did have the Lin Kuei, or "forest demons", who were masters of deception, guerilla warfare, tricks and traps, and mastered a style of throwing weapons combat called An Ch'i, and are said to be predecessors to the Ninja.
Other lands also had Ninja, or ninja-like folks: Korea had the Sulsa, who were to the Hwarang (young noble knights) what the Japanese Ninja was to the Noble Samurai.. Only were accepted as official members of the Silla armies, unlike the Ninjas, who were considered social pariahs. And Tibet had the Trulkor, who's fighting and espionnage skills were heavily based on the principles of deception and illusion.[/i]
-Exit the LoneWolf