[MuGen]

Now now.... ancient writings suggest Ninja's never fought head to head with anyone. Ninja's knew they stood no chance against fighters and Samurai. Thats why Stealth Assassins became their primed job description.

So, he's definitely not a ninja, but shows knowledge in some form of Martial Art. In ancient scrolls that I was lucky enough to look at, they said a Ninja's Ultimate Technique was 'Running Away' or 'Nige Rou' in Japanese.