If you were a kid in the early 1960s you would know that 'ninja' is not over the top at all:
http://en.wikipedia.org/wiki/The_Samurai_(TV_series) The KOGA ninja were the baddies - whilst the
IGA ninja with
Tombie the Mist along with
SHINTARO (the Samurai) were the good guys. I'll go bad black hat stealth any day.

"...Tombei is a master of disguise, skilled with shuriken, swords (using the reverse-grip technique) and scaling hooks, also able to call-in the additional Men of Iga, and the two saved each other's lives numerous times. His outfit is a grey version of the shinobi shozoku Iga outfit (as opposed to the black-clad ninja opponents)..."
IGA is another foreign SuperMarket outlet in Australia these days so I don't think that name would ever fly!
Maybe
RONIN would be a good compromise but if youse cannot spell it then....
A4G Skyhawk: www.faaaa.asn.au/spazsinbad-a4g/ & www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/videos?view_as=subscriber