I thought Serenity's voice was perfect: in the first comic it describes her voice as being like a low hissing or "like a small child choking on a rattle snake" XD I love Serenity rose, as cheesy as it may sound, I can relate to her and her life.
Oh my goodness, amusing, deliciously creepy and hauntingly charming. Beautiful stuff. I must confess, when I bought your Serenity Rose book, and later discovered this film, well...I didn't quite expect Serenity's voice to sound like that. 8D Heh.