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Did gargoyles originate from Asia? Afterall half of the eight clans originated there and in east Asia there is about three clans presently living there meaning that there might have been a large abundance of gargoyles clans living there and also the people in Ishimura don't fear the gargoyles meaning that gargoyles must have lived there quite along time for the humans to get use to them.
I'm not saying at this time. But in any case, you're logic above doesn't wash.
The survival of three clans in Asia hardly proves anything, as each clan survived for very specific reasons. And every one of the seven old clans have been in place for centuries. And at one point or another, all got along with humans. The Ishimurans managed to maintain the relationship, but it hardly suggests or guarantees a geographic origin in Japan.
After all, two clans also survived in Great Britain -- a much smaller area than all of Asia -- so by your logic, we might assume that Gargoyles originated there.
But I'm not confirming any of it. Asia, Britain or somewhere else? I'm not saying now.