If I will ever become a vtuber and have to create a twitter account my pronouns will be Nig/Ger, because I feel myself to be a person of Nigerian and German heritage.
If anyone also needs some cool gender ideas for their tabletop RPG campaigns here is small collection of what you will see in the Western vtuber section of twitch
https://what-the-heck-gender-am-i.tumblr.com/genderdictionary