You can't yet.
Shadow of the Ninja happened in 1990.
Shadow of the Ninja was created on 1990-08-10.
Ninja Gaiden Shadow happened in 1991.
you need an itcy itcy paradice scroll that you can buy at the weapon shop at shadow of the wind village (i think it cost 2500 to 3500. i am not exactly sure) then talk to the jonin ninja outside of the shop then press become a ninja then accept to give the scroll to him and you have unlocked the ninja armor and can start to train to become a great ninja....
Ninja Gaiden Shadow was created on 1991-12-13.
in shadow of the wind village you can become a ninja in opsrey cove you can become a pirate in the necropolis you can become paladin, necromancer, and doom night in sunbreeze grove you can become dragonlord p.s need to have dragon amulet in popsrocket you can become technomancer in ravenloss you can become shadow weaver
you get it in the beginning
You can become a ninja by going to Lakeshore and Ty will teach you to become a ninja.
Ninja Shadow Warriors - 2012 was released on: USA: 5 March 2012 (TV premiere)
The cast of Ninja Shadow Warriors - 2012 includes: Mami Hishida as Female Ninja Agent Shigeru Inoue as Old Ninja Master Toru Iwasu as Oda Nobukatsu Yuki Tsunematsu as Ninja Master Tanba
you unlock it in a cheat