Currently Phabricator only supports Latin characters in usernames. #Wikimedia has 1000s of users with non-Latin scripts. It would be nice to give them the chance to have their same usernames in Wikimedia Phabricator.
See [[ https://en.wikipedia.org/wiki/Wikipedia:Naming_conventions_%28technical_restrictions%29#Restrictions_on_usernames | MediaWiki/Wikimedia restrictions for usernames ]].