Question: How to make friends make new characters

[ManindraDeMel]

I have a Linux dedicated server. When I join (as the host) I have the issue where i have to make a new character. However my friends can join using their old characters. This then raises the question. How does my friend make a new character for this world?

Im asking this because when i convert my GUID to the new GUID my friends have to make a new character. But once that character is made it doesn't make a new .sav file for them..