agent
art
asian
assassin
assassination
background
black
caucasian
combat
costume
culture
dangerous
fight
fighter
grey
hide
invisible
japanese
killer
legendary
male
man
martial
mercenary
ninja
ninjutsu
ninpo
oriental
people
person
professional
secret
shadow
shinobi
shinobinomono
skilled
spy
stealth
thief
traditional
trained
warfare
warrior