Change Discussions username.

I've seen that some people are able to send my request to the moderators to change my username, if somebody would be so kind to help me with that I'll be very grateful.

If a moderator see this, here are the usernames I want to use from the most preferred to the least:

1. Jōtarōゴゴゴ
2. jotaro-gogogo
3. jotaro_gogogo
4. jotaro.gogogo