One possible plot could be that Sakura's real mother was in hiding for some reason, like she was being hunted. Sakura accidentally stumbles upon the truth and has to find a way to protect her mother. Along the way, she learns about her mother's past, her family heritage, and maybe even discovers some long - lost relatives. This could lead to a series of adventures as Sakura tries to keep her mother safe and uncover the whole truth.
Perhaps it focuses on her relationships. It could show how she met Sakura's father and what their courtship was like. There might be some interesting stories about their first encounters and how they fell in love in a world full of ninjas.
One possible plot could be about Sakura's parents' courtship. Maybe they met in a beautiful cherry blossom garden, where her father was immediately smitten by her mother's beauty and kind heart. They then overcame some family - imposed obstacles to be together.
Well, it could be about a disease that is slowly taking Sakura's life. Maybe she has some rare illness that the characters in the fanfiction are desperately trying to cure.
A possible plot could revolve around a magical world where the sakura in heat is a sign of a coming change. The sakura's intense state of bloom releases a special kind of magic that affects the animals and other plants in the area. There could be a group of adventurers who are trying to understand this phenomenon. They meet different characters along the way, like an old hermit who has knowledge about the sakura's cycles and they all work together to protect the sakura when a dark force tries to corrupt its magic.
Well, it could involve Sakura facing her inner demons, perhaps in a battle against her own dark thoughts and temptations. Maybe she has to struggle with a new power that has a dark side to it.
One possible plot could be that Sakura grows up not knowing who her father is. As she discovers her connection to Hidan, she might struggle with her identity. She could be conflicted between her ninja values learned in Konoha and the more extreme and violent nature associated with Hidan. Maybe she tries to understand Hidan's past and motives while also dealing with how the ninja world would view her as his daughter.
Obviously, Sakura's mother herself. And her family members like her parents or siblings if they are relevant to the story. They could have influenced her in different ways.
Perhaps a plot where Yagura's sister has some special power that Sakura helps her develop. They could go on a journey together to master this power and along the way, face enemies and make new friends. It could also involve some political intrigue in the hidden villages as they deal with the implications of this new power. The story might explore how their relationship grows stronger through these shared experiences.
One possible plot could be that Sakura gains a new understanding of Naruto's struggles and his past traumas. This might lead to her seeing him in a completely different light, perhaps strengthening their friendship or even leading to some romantic feelings if the fanfiction takes that route.
Perhaps Sakura is in the mental hospital because she was wrongly committed. In the fanfiction, she could be trying to prove her sanity. Along the way, she forms unexpected friendships with other patients and staff members. These relationships help her on her journey to regain her freedom and also help her come to terms with parts of herself she didn't understand before.