Which version of Joomla are you using?
If you are using a text field, users can enter their characters by name manually. If you use the rpcharactersfield type field, users can select characters (and if privilege granted, they also can edit their own character).
That field is there to provide the possibily for users to assign character to their own accounts, not for link to roster.
As Raid signup is character based, the system has to know, which character is assigned to a user.
So in case of text field, the following should be there:
Gimli
Legolas
Gandlaf
(each in a separate line)
In that case those 3 characters in the guild will be connected to that user.
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