speaking Japanese isn't even required.
source of article: http://www.japantimes.co.jp/news/2016/03/13/national/aichi-advertising-full-time-ninjas-tourism-push/#.Vug8r5MrLJw
get a job as a bonafide ninja: http://www.pref.aichi.jp/soshiki/kanko/aichi-ninja-bosyu.html
https://www.youtube.com/watch?v=FEL0TXr2y0A
Japan's Aichi prefecture is hiring six people to be real, live ninjas. The job is more about performance art than stealthy killing, as their intent is to promote so-called "warlord tourism."