Board Thread:General Discussion/@comment-4519633-20141022032431/@comment-24674051-20141022210513

We know nothing about that person. We don't even know if any such person exists.

There are a few others that we have little to no information, such as the Sorcerer, the Apprentice, Zoso, the Previous Dark One(s), the Blind Witch (Hansel and Gretel), the Other Oz Witches, Merlin, etc.

I am also not including the OUaTiW characters, simply because I haven't seen that series yet (it's on my bucket list of things), so I can not speak intelligently about them.