Well, Gaara in high school fanfiction typically has a troubled past that makes him keep to himself. However, Sakura's positive attitude towards him can change this. She might invite him to join group activities at school, like a school play or a charity event. At first, Gaara is hesitant, but as he sees Sakura's enthusiasm and the way she cares about others, he starts to be more involved. His personality gradually shifts from being withdrawn to being more involved in school life and more trusting of others. Sakura, on the other hand, becomes more patient and understanding as she tries to reach out to Gaara. She learns to look beyond the surface and understand the pain that he might be hiding.