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> Do ethnic Japanese still compete in top sumo? Aren't they all Mongols?
I mean, they do, but they have acquired a tendency to sneak out and visit hostess bars, after which they get suspended for a number of tournaments for shamefur dispray. Only Mongols are upstanding sumotori with required hinkaku.
> Do the mongol sumotoris come from Mongolia or are they an ethnic subgroup of japanese citizens?
Most of them come from Mongolia; however some already grew up in Japan. Example: Hokuseiho (his parents moved to Hokkaido when he was a kid and he went to school in Japan)
> If from Mongolia: do they speak correct japanese? Do they return to Mongolia or stay in Japan? If they stay, do they take ethnic Japanese wives?
Foreigners are required to go to 1 year special school course
to learn what is expected of them about Japanese culture.
Those who want to become sumo coaches/elders stay in Japan (and need to acquire Japanese citizenship), others have returned (e.g. Asashoryu – expelled for shamefur dispray, or Harumafuji – expelled for shamefur dispray)
Hakuho's wife is Japanese
Kakuryu's wife is Mongolian, she moved to Japan and will presumably stay there since Kakuryu intends to stay as an elder
Terunofuji's wife is also Mongolian but she was already in Japan before due to studies