Ninja spies are perhaps the most enigmatic and mysterious class. While some ninja are little more than assassins , true ninja spies are masters of exotic weapons, tools of stealth, and strange ki powers. Ninja spies are members of a secretive ninja clan, the head of which holds absolute authority over the ninja's life and death. They are sworn to secrecy to protect the identities of their clan members and must never reveal that they are ninja. Despite their inclination to evil, ninja believe strongly in a code of honor, and risk offending their family (and earning a death sentence) if they break that code of honor.
Some ninja have a magical background. In Rokugan, ninja are the stuff of legends. Some refuse to believe they exist. Ninja train in the Shosuro school of the Scorpion clan, though other, mysterious ninja may operate in the Empire as well.