Wow! I'm surprised (Yet delighted) that The Wheel of Time series was mentioned. I was just going to reply in the same manner XD
I know that I wanted to cosplay from various books, like WoT or The Mask and the Sorceress. If I could, I would also cosplay as Miss Marple ^_^; or anything Agatha Christie.
But so far I have cosplayed one character that was based from a book, and that was Lestat de Lioncourt.
The only thing about really obscure cosplays is that you would have to be elaborate/well done enough to get really noticed in general.
However, that being said, you should totally do those costumes. I personally don't know who they are, but that is the beauty of cosplays....the variety and the opportunity to learn new series