How do you have to be to become a ninja?

Answer 1

to be come one of us you must pass a series of tests to determine if you are worthy than you begin to than in the arts of sword, hand to hand , poison, bow, chain weapons, throwing weapons, evasion and zen

we are not assassins we are a sect of the samurai

Answer 2

Dear ben, you gota do real stuff on this website

Answer 3

Go to karate/judo and attack a couple of people, injure them and get a black belt. Either that or just run around claiming to be a ninja:)I hope you found it helpful :P