The Japanese Super-Warrior!
Ninja are spies trained in a special kind of physical art called ninjutsu. Ninjutsu involves sneaking into enemy camps or people's houses; disguising themselves, using tricks to escape, and so on. Ninja served powerful people and used to spy on enemies, destroying their weapons, and assassinating their leaders. Ninja were the most active in the sixteenth century. They no longer exist in Japan today.
In the past, there are said to have been about 50 different schools of ninja scattered more or less across all of Honshu, Japan's main island. There are several places that are still known today as "lands of the ninja".
The ninja were known to travel across water, go underwater, climb over high walls, break into places without making any sound, and disappear in an instant.