1. ninja - Noun
2. ninja - Adjective
3. ninja - Verb
a class of 14th century Japanese who were trained in martial arts and were hired for espionage and assassinations
a member of the ninja who were trained in martial arts and hired for espionage or sabotage or assassinations; a person skilled in ninjutsu
Source: WordNetMaybe. Although I doubt most Shadowhunters get a tattoo of Donatello from the Teenage Mutant Ninja Turtles on their left shoulder. Cassandra Clare
Got to keep thatin mind. I'm a ninja now... I swore I'd never freeze up or run away again... AND I WON'T...! Masashi Kishimoto
It was things like the Teenage Mutant Ninja Turtles, he thought, that made you believe the world was maybe just as well off destroyed. Stephen King
Every Halloween for six years, I was a Ninja Turtle, and Mikey was my favorite. The turtles really made me who I am today. They got me into martial arts, meditation, surfing, skateboarding; big time influence on who I am today. Greg Cipes
I call this one the Ninja Center-fold! ~ Naruto. Masashi Kishimoto
Including a mention of your impressive record.... The man who had penetrated and copied over a thousand techniques.. Kakashi the mirror ninja. Masashi Kishimoto