Are You A Ninja !?

a guy who dresses in black who lives by no code a rogue samurai who broke the bushido code an assassin, spy and impersonator hired to retain information

a gun a shuriken, dagger, sword etc. darkness

depends no yes

buddhist mystics who traveled to japan japan somewhere (it's top secret)

iga and kanto iga and koga the uchiha and naruto clan thingy