I think they’re great characters, too, but I don’t think they’re “main” characters any more than Neville and Luna are main characters in Harry Potter. Felurian has almost 100 straight pages dedicated to her, and she does more to assist the development of the plot (i.e., Kvothe’s development) than any other woman in the story, possibly aside from Denna. Although I’ll admit that this sort of thing is open to interpretation, and mine is no more valid than anyone else’s.