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I'd love to be able to use Ω

I would like to be able to use "&" for my username. This would benefit a lot of duo streamers, like myself, who don't use a singular name to represent both members.

This would reduce the length of some usernames as well. Please consider adding this!

Just like below I would love to be able to update my username to include kanji. I want to remove "captain" from it and change it to Gato猫. That kanji means cat.
Please add this ability!

Some special symbols might hold certain functions in code and preventing these from being used ensures that usernames are more 'stable'.

/ | . * % are symbols that have certain functions and I can understand them not being allowed.

- + & I do think should be allowed. & does have some functions, but that's usually in combination with # or ; which isn't allowed anyway.

In addition to this & the other reply, the name I use in games is Jōtarōゴゴゴ, it would be welcomed and appreciated if we were able to use characters from other languages in our usernames as well as macrons on top of letters (ā, ē, ī. ō, ū).

I would like to use special characters in Display Name.

My current display name is ゆうた敗北 and I want to change it to ゆうた(敗北) or ゆうた「敗北」.
Please allow to use parentheses and Japanese brackets.

Note that Display Name is different from Username:
https://blog.twitch.tv/en/2016/08/22/localized-display-names-e00ee8d3250a/

Having the feature to be able to use frequently used special characters like * & + - for example in usernames. Thank you in advance.

I found underscore works but I personally wanted to include a space or a colon but cannot.