Definitely. The Fruits Basket manga is complete. It provided a satisfying conclusion to all the arcs and left fans with a fulfilling reading experience.
First, really understand the character of Hatsuharu Sohma. Dive into his personality traits, his backstory, and what makes him tick. Then, think about how your reader character would interact with him. Create a unique situation or scenario for them to meet in. For example, if it's set in the world of the original story, it could be at a special event. Keep the dialogue natural and in - character for both of them.
One possible scenario in a Fruits Basket reader insert fanfiction could be the reader being a new student at the school. They accidentally stumble upon the Sohma family's secret and instead of being scared off, they offer their friendship and support to the cursed members. This could lead to a heartwarming story of acceptance and love, as the reader helps the Sohmas deal with their insecurities and the challenges that come with their curse.