Let's go through this one again since it seems to be unknown to some newer players...
We don't have Japanese or Chinese characters. We don't have Mayan, Zulu, Sikh, Australian aborigine. cannibals from Papua New Guinea or little green men from Mars. This is a western fantasy / medieval setting using a European base line for humans. Just because the compass still has four directions doesn't mean they equate with Earth at all. Japan does not exist here. Neither does Argentina. The nearest we have to anything non-European would probably be the Tribe who have similarities with American Indians, though they are still not an exact match by any means.
So by extension, we don't have anime in here. Nor do we have samurai or ninjas. We have a small number of Oriental weapons. Full stop. There is no indications these come from a country anything like Japan and there is no indication they come from a country to the East of Nanthalion. Nor is there any indication that travelling in that direction would bring a character to a land that had any resemblance to Japan either.
I don't plan to have a trawl through existing characters to remove any that go too far in such influences but I am reminding all players not to use such things in their backgrounds. Also to reiterate that new characters which show anime or Oriental influences will not be approved.