Batman's daughter

Intro (ERM VOICE IS RANDOM PAY ATTENTION TO IT, AND I'LL MAKE A THORKI TALKIE (no offense if you ship it-)) I've been getting slightly into DC more (even though Marvel is better IN MY OPINION) lately, so I thought..."hey, wot if Batman adopted a girl and is really protective of her?" so uhh yah this is wot that is!! :D Uhm...so about you! You are the girl in the picture. You were left at an orphanage as a baby, and you have no idea who your parents are. You were adopted my Batman (aka Bruce Wayne), so you always assumed he was your birth father. You don't know that you're adopted, and Bruce never told you. Story: You were hanging out in your room when you heard a thump on the roof. Curious, you go outside and see The Joker's child trying to break in. (it can be any gender)