Copyleft is essentially a license applied to a work by a copyright holder which allows reuse, the equivalent of a Creative Commons SA license, whereas a creative work is orphaned when a copyright holder is unknown or cannot be located to ask his permission to use a work. They’re really quite different things. (07:27)
Characters debuting in orphan works are technically still under copyright and have no license for reuse, so a wiki like this one wouldn’t have a broader category. (07:40)
Category:Characters? (07:44)