Who is Suzanna Turquois Blue from Sir Thursday and what is their importance?

Suzy is also a friend of Arthur. She is not a Denizen, but a Piper's child. Suzy has been alive for hundreds of years and was in the Army of the Architect at one time. However, Suzy has been "cleaned between the ears" and can't remember large parts of her life. She is willing to do what she has to in order to help Arthur in his quest. She is also someone who knows about the House and is willing to help Arthur understand things he isn't familiar with. Suzy is not afraid to disobey orders and enjoys upsetting Dame Primus.