Mind you, I'm a cynic, but, to despite the way both Fie and Layette approve of her, I can't help but find the younger sister to be a bit… fishy. Mainly because she never once tries to help Fie, and, as of the end of volume two, it doesn't seem like she ever has. Either she's epically oblivious and/or passive (unlikely, I think) or she has some actual ill intent (maybe she was afraid that her sister would want vengeance on her for having innocently even taken her name?). Given the unspecified crime which Roy is so worried about… I'm guessing it has to do with how Fie learnt to write?

Opinions?

Ummm I think Fie's sis is just a little... dense? and Air headed? The word obvious totally fits with Fiiru. Did you read the side story with Fiiru? You can kinda get an inking to Fiiru's true character there... But yeah, I was a little suspicious too, but with few chapters with Fiiru kinda veered off my suspions, cause she was hella passive. But who knows if she really is evil? I doubt it though, from the chapters that she did show up in.