Hm o.o maybe to help out with the mass character creations of them not being used would be an option for players to delete their non use able avatars. Perhaps also an option to create a new character for that same server. (Like in Crystal Saga)
With this, players can rid of old characters they never use and yet make new characters. Of course, to avoid "accidental deletion" give like double confirmation of deleting character or to type "delete" for a confirmation.
I hope this idea is thoroughly thought of and into consideration ^^~