The other hospital staff would be important characters. There could be an experienced psychiatrist who acts as a mentor to Sakura. And then there might be nurses who help Sakura in her daily tasks, like taking care of the patients' physical needs.
There could be the patients, of course. Each patient might have their own unique backstory and personality. Maybe there's a young patient who is dealing with trauma, and Sakura has to find a way to reach out to them.
Perhaps in the fanfiction, Sakura Haruno discovers some secrets within the mental hospital. It could be about a hidden experiment or a patient with a very special ability that she has to handle while also trying to keep the hospital running smoothly.
One idea could be that Sakura uses her medical knowledge from her ninja training in a unique way at the mental hospital. For example, she might use her chakra control to soothe the patients' agitated mental states in a non - traditional therapeutic method.
A plotline could be that Sakura enters the mental hospital to help a friend or a patient she heard about. Inside, she discovers that there are forces at work that are suppressing the patients' true selves. She decides to fight against this system, using her medical knowledge and ninja abilities to bring about positive change in the hospital environment.
In fanfiction, Sakura might face the challenge of dealing with patients who have post - traumatic stress disorder. She could use her own experiences of war and loss in the Naruto world to empathize with them and develop new treatment methods.
Sakura might become more empathetic. Being in a mental hospital, she would encounter people with various mental health issues. This could make her more understanding of others' pain and struggles, and she could develop a softer side.
Ino would most likely be there too. Since they have been friends since childhood, Ino would be worried about Sakura's condition. She might bring some flowers and stay by Sakura's bedside, chatting with her about their memories and the village.
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.
I don't know for sure, but since it's a fanfiction centered around Sakura Haruno, she is the main focus. However, it may also feature characters who had a major impact on her life. This could include her sensei, like Tsunade, who trained her in medical ninjutsu. There's also a possibility that new characters created specifically for this fanfiction could be main characters as well, but that's just speculation.
In some Sakura Haruno alpha fanfiction, Kakashi could be a significant character. He might act as a mentor to Sakura in her new alpha role. He could guide her in making difficult decisions, like when she has to choose between the safety of the village and the life of a comrade.
One possible plotline could be that her friends from the ninja team come to visit her. They bring her small gifts like flowers or her favorite food. As they visit, they share stories of their latest missions, which makes Sakura feel a bit better and less isolated in the hospital. Maybe Naruto tells her a particularly funny story about how he messed up a jutsu but still managed to save the day in a clumsy way.