Xianxi Sha, a character from Chinese literature, primarily expresses a sense of longing and nostalgia. This emotion is evident in her character development and interactions with other characters. The data supporting this analysis comes from various literary works featuring Xianxi Sha, which consistently portray her as someone deeply attached to her past and the people she has known.

In "Dream of the Red Chamber," Xianxi Sha's longing is particularly poignant. She is constantly reminded of her past, her family, and the love she once had. Her emotional state is often described as melancholic, reflecting her deep yearning for the past. This is further reinforced by her interactions with other characters, such as her brother Baoyu, who shares her sense of nostalgia. The narrative often highlights their shared memories and the pain of losing them, emphasizing the emotional depth of Xianxi Sha's character.

Additionally, Xianxi Sha's longing is also evident in her relationships with other characters, such as her love interest, Jia Baoyu. Their love is complex, filled with both joy and sorrow, as they navigate the challenges of their society and personal desires. Xianxi Sha's emotional journey is a testament to her deep attachment to her past and the people she has known, making her character a compelling study of human emotion.

The consistent portrayal of Xianxi Sha's longing and nostalgia in various literary works underscores the significance of this emotion in her character. Her emotional depth and the complexity of her relationships contribute to her enduring appeal as a character in Chinese literature.