Bonds of Family
I got the idea by reading the fic Perfection, which lead me to a challenge by dracohalo117. I was going to take it, but I couldn't make it work so I twisted it around unrecognizably and created the story Bonds of Family.
Hikari lives for Root, despite doubts, Danzo is like a father to her and Sai, her brother. They are a well-known tag team among the Ne force, and Hikari is an upcoming seal master with a special kekkei genkai that she has no idea what to do with and a strong sense of loyalty and friendship.
Kashi is an orphan who lives on the streets and in the sewers, teaching himself to be a ninja, all the while unaware of his powerful heritage and the family he has living right under his nose until a chance meeting gets him the recognition he never wanted.
Kazuya is Orochimaru's prized escaped experiment with influential ties not even she knows about and a stronger will to live than anyone expected and the ironic inability to die.
By chance these three will come together and shake the shinobi world, uprooting secrets and dark shadows. With a war coming, they'll need to trust each other and their allies, but is that possible with their shady histories? Maybe all they need is someone to care about and someone to care for them. These three will either bring Konoha together or tear it apart from the inside out. The rookies will learn that you don't need to be related to be a family and that will make them stronger than anyone else. For better or for worse.