Hum... interesting to see this thread back.
Looking at it again, I really think that the macanese people are a really interesting example. There's Portuguese, Chinese, Malay, Japanese, Indian and Sinhalanese DNA in only one small ethnic group!
It would be fascinating to see this in larger scale. Maybe if the Portuguese colonize Taiwan before Japan goes Sakoku, there could be a Formosan people similar to the OTL macanese, though probably with more Japanese blood and with Taiwanese aboriginals added to the mix. If the Portuguese also get Northern Luzon together with Taiwan, you could get an even more interesting mix.
Well for my Portuguese Asia TL which is still on drafts, I was thinking that if Oda Nobunaga survives and Catholicism in Japan is limited to Kyushu (in a no Sakoku scenario), there could be some Portuguese settlement in Nagasaki as their concession and in Saga to some extent and intermarrying with the Japanese, forming a new Luso-Japanese ethnic group that speaks a Patuá/Creole language similar to Macanese but with very heavy Japanese and some Ryukyuan influences, the latter due to the Ryukyu Kingdom becoming a vassal of Portugal after the Ming collapse and is eventually annexed a century later.
I can expect facial appearances similar to the looks of popular half-Japanese half-American model Jun Hasegawa to be more common around Hizen province as the typical face for a ATL Luso-Japanese woman, but again, models and celebrities aren't good representations of common Japanese or Hāfu people.
And regarding Taiwan, I was thinking about that idea too, where Portuguese, Taiwanese aboriginals, Japanese, Ilocanos/Pangasinan/Kapampangans and Ryukyuans living in harmony and there is a high degree of intermarriage between them.
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