Yes, in some fanfictions, creative interpretations might make Sakura Haruno be related to Yagura as his daughter. Fanfiction allows for a lot of such unique and often unexpected relationships to be explored.
One possible storyline could be that Sakura has to deal with the expectations and secrets related to her father's past. For example, if Yagura had some dark deeds in his past, Sakura might struggle to come to terms with it.
One possible plot could be that Sakura, as Yagura's daughter, discovers her true heritage later in life. She might struggle with the implications of being related to someone who had a complex history in the ninja world. For example, Yagura was once under the control of the Sharingan. Sakura could face prejudice from those who knew of her father's past. But she could also use her own skills and the knowledge of her family connection to try and redeem her father's name in the eyes of the ninja community.
She might be more secretive. Knowing that her father had a dark past due to the Sharingan's influence, she could be more guarded about her own past and family. For example, she might not be as open with her friends in Konoha as she was originally.
There might be some out there. You could try searching on fanfiction platforms like FanFiction.net or Archive of Our Own. Just type in 'Sakura Haruno Yagura's sister' in the search bar and see what comes up.
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.
A fanfiction could focus on Sakura's self - reflection on her birthday. She looks back at her journey from a young, insecure girl to a strong and confident kunoichi. She spends the day training alone in the forest at first, but then her friends find her and they have a heartfelt celebration together.
Sakura might start her first fight in fanfiction feeling nervous but determined. She may be up against a bully or a small - time criminal in the ninja world. Her first move could be a simple punch or a kunai throw. If she's underestimated, she can use that to her advantage and surprise her opponent.
In Akatsuki fanfiction, Sakura Haruno might be given a unique Kekkei Genkai. It could be something related to enhanced strength or perhaps a special type of medical ninjutsu on a whole new level. For example, her Kekkei Genkai could allow her to heal not just physical wounds but also mental traumas instantaneously, which would be a very interesting addition to her character in the context of Akatsuki fanfiction.
One possible fanfiction could be where Sakura sacrifices herself to save her friends from a powerful enemy. Maybe she uses her medical skills in a self - destructive way to transfer the life - threatening injuries of her comrades onto herself.
Sakura might meet the founders of the village. For example, she could meet Hashirama Senju. He was a powerful and visionary leader. Meeting him could give Sakura insights into the true origins of the village and how to better protect it. She could also learn some of the ancient ninja techniques from him.