In *theory* you should be able to follow this test user:

@你好@i18n.viii.fi

But I can't find any Fediverse software which actually supports non-ASCII usernames.

If you are able to see the user, its description, and its avatar - please send me a screenshot 🙂

#Fediverse #ActivityPub #Unicode

@[email protected] -- It's also used for the username component of email addresses iirc; as these are originally also specified as 7-bit US-ASCII. So I convert local usernames with idn. Just something I did out of habit really. You can use UTF-8 if you want, so I'm only saying that punycode seems to federate better based on my experience. We tested this with a bunch of fediverse software at the time and it just worked. We'll accept either.
@macgirvin that's interesting, I hadn't thought of using punycode. Like @[email protected] my exposure to it was strictly limited to domains (and even then only to counter domain spoofing)