I made a page for unlinking a character from your FFXIAH.com user account. I have done some testing but there might be bugs. Keep in mind, if you delete comments, screenshots, or private messages, it can't be undone. If you unlink a character where the server no longer exists, you can't reverify.
If you have a character that you don't want associated with your username or other characters on your account, I recommend that you unlink it.
http://www.ffxiah.com/members/unlink
Use it at your own risk. Report any serious bugs via PM, or in the bugs forum. All unlink transactions are logged.