There is a way to "kill" your character permanently in UFL system. It is done using
!die
command.
This will kill your character permanently, marking it in UFL roster as permanently killed by whoever was your last opponent. It will look for your latest battle with fatality, and use that opponent as your perma-killer. If there were no fatalities, it will use jsut any last battle. If you did not have any battles at all, then it will... I'm actually working on that.
You won't be able to use that same F-List character again to play with UFL system, however, so use this command at your own risk.
You can, however, change your f-list character name, or you can just create a new f-list character, and register with the system again.