Day 16 is favorite female character. Well, this one is tough because I don't like how so many book portray females as weak or needy or whiny.
My very first favorite female character to come to mind was Hazel Grace from John Green's The Fault in Our Stars. (Not to be a spoiler but hello, she fights cancer!)
Also, Blue Sargent from Maggie Stiefvater's The Raven Boys, comes to mind for favorite female character. (She refashions her clothes and hangs with the boys!)