Characters unable to be deleted

Describe the problem. Be as specific as possible!: I created a character during the rollback period. Since it was only my intent to use it for a short time, i gave it a nonsense name and then deleted it. i was a bit surprised when it got rolled back into existence, but no big deal; i could just delete it again later when i needed the slot. right? Nope, This character cannot be deleted at all now. It's quite annoying because i would like to make a real character in that slot, but now it's permanently occupied by a poorly named mule.

I'd rather not take a screenshot of my login, but when i attempt to delete it, it simply says "Failed due to an unknown reason."