Suzume Imamura is Yumemi Hidaka's classmate and childhood friend, radiating an optimistic, cheerful personality and often described as living at her own pace. Her demeanor carries a childlike immaturity, frequently illuminated by her smile. Despite this outward presentation, she occasionally reveals unexpected insight and an outsider's perspective, surprising others with perceptive observations.

She develops a significant relationship with Kazuya Takamori, loving him deeply. Their bond culminates in a symbolic act of commitment they call "marriage," achieved by crossing a river together to signify their willingness to face future obstacles. Kazuya, a former delinquent who once contemplated suicide, credits Suzume with helping him find strength and appreciate life.

Within the group dynamic involving Yumemi and Ichiko Ono, Suzume adopts a supportive role. She demonstrates clear understanding of Yumemi's connection to Munto and the floating islands, especially when Yumemi decides to assist Munto in the second OVA. Suzume helps convince the protective and anxious Ichiko to respect Yumemi's choice, reassuring her the situation will resolve positively, thus highlighting Suzume's capacity to mediate during emotional circumstances.

Her background includes working part-time as a shrine maiden alongside Yumemi and Ichiko at Takashi Tobe's family shrine during the second OVA. Her characterization remains consistent across the OVAs and television series, consistently focusing on her supportive friendships, her relationship with Kazuya, and her distinctively cheerful yet occasionally perceptive nature.