I'm looking at a story which includes words from Japanese martial arts.
I'm sure that all common nouns, e.g. nunchaka, should be in italics to alert readers the words make no sense in English.
I'm not sure about proper nouns, e.g. the name of a particular style of martial arts. Is title case enough for those? Isn't the purpose of title case to alert readers that words may not make sense because they may be an arbitrary name someone chose to identify something?