In this fanfic idea, Sakura has a prodigious younger sister who makes jounin at age nine, and is ordered to be co-sensei of her sister's team with Kakashi. Sakura's little sister has pink hair that she keeps in a ponytail that goes to midback, and wears her headband around her forehead, along with dark turquoise eyes like her father. She wields a Naginata(See picture below) and has a tiger summons she picked up while she was a beginning chunin. She has an innocent personality, is very nice, happy, and adores Sakura. But Sakura strongly dislikes her sister, which gradually grows to hate as the story goes on, and Sakura notices that her little sister gets noticed by Sasuke more than herself, at least PTS. How's that sound? I've been toying with the idea for a while now. I think it could prove to be interesting, seeing as most Sakura's sister stories have the sister being older, or Sakura's twin, opposed to younger. I'm not sure what Sakura's sister would be named, or who she would end up with, if anyone at all, and in a Shippuden sequel, the story would start with Sakura's sister being 13.