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I got the following error:
Oops! There was a problem updating your profile:
- Display Name can only contain letters, digits, spaces, apostrophes or hyphens and must start with a letter or digit
after I tried to set my username using Japanese letters: イオニカ・ビザウ.
Which of them cannot be used?
I cannot try every letter to see if it pass the validation because I cannot save my username again, then.
It is the ・ (U+30FB Katakana middle dot, category "Po, Other_Punctuation") codepoint that is not allowed.
Use a space instead, Katakana letters themselves are perfectly valid:
The name is filtered with the .NET \w character class which includes any Unicode letter categories (Ll, Lu, Lt, Lo, Lm), connecting characters (Pc, connecting punctuation, underscores really) and numbers (Nd), with a dash of hyphen, space and apostrophe thrown in; Katakana characters are "Lo, Other_Letter" for example.
ツ). Perhaps it's the・? Or perhaps you cannot start the username with a Katakana character (such asイ).・: ux.stackexchange.com/users/36995・is not a valid letter?