I was recently in an Xbox party with 3 char anime/Japanese theme tags. I asked them why there weren't any numbers after their tags and they went on for two hours teaching me about OG tags and that his $750 tag was a steal as it wasn't just random letters, but an actual word. The other guy paid $1,500 and at one time paid $12,000! They explained you can buy them on IG or a site called ogusers, but that you should always use an intermediary who holds the account and your bitcoin, and acts as a security check middle man for a small fee.

They also told me about an MS website hack, where you could enter spaces into your name by changing the client-side javascript and entering about 500 spaces between each character and then filling the field with spaces until maxchar.