Kanon Konomori is the class representative in the same elementary school class as Hinata Hoshino and Hana Shirosaki. She stands 141 cm tall with short grey hair and hazelnut eyes, typically wearing her school uniform: a navy blue dress with long white sleeves, a white collar, a red bow, brown shoes, and white ankle socks.

She speaks softly and acts kindly, earning a reputation for reliability that leads classmates to frequently seek her help. This reliability sometimes frustrates her best friend, Koyori Tanemura, due to the attention Kanon receives. Kanon maintains optimism in most situations and displays skills across multiple areas, learning new tasks like sewing quickly. However, she visibly struggles when attempting to make jokes. Her care for others' feelings is clear; she avoids anger and offers comfort, such as when Koyori makes mistakes or when Miyako Hoshino feels anxious over school rumors. After encountering Miyako, Kanon reassures her upon realizing the exaggerated rumors don't match Miyako's kinder true nature.

Kanon shares a longstanding friendship with Koyori that began in kindergarten. A significant early incident involved Kanon's balloon getting stuck in a tree; Koyori retrieved it, fostering Kanon's profound gratitude and loyalty. This event established Kanon's protective dynamic towards Koyori, aware of her clumsiness. Kanon habitually carries adhesive bandages anticipating Koyori's accidents and provides steadfast emotional support, believing in Koyori's aspirations despite setbacks. Kanon's feelings for Koyori extend beyond typical friendship, including implicit romantic undertones. In one interaction, Koyori asks Kanon to pretend to marry her, causing Kanon to react with initial acceptance followed by visible embarrassment upon processing the request.

Across various media, Kanon shows gradual development in social confidence. Initially, she expresses embarrassment about wearing cosplay costumes and resists participation. However, observing peers' enthusiasm, she eventually joins group activities, wearing a White Lily costume and participating in coordinated outfits during events like the anime film's summer festival. Her involvement extends to school trips and broader social engagements, including a visit to Hana Shirosaki's grandmother alongside other classmates and Miyako. During these outings, like zoo visits and festival activities, Kanon interacts comfortably within the group.

Her relationship with Koyori remains central, characterized by mutual dependence—Koyori provides emotional support while Kanon offers practical help and affirmation. Kanon's unwavering belief in Koyori's potential persists through challenges, reinforcing their bond. She also forms connections with other characters, including Miyako, whom she reassures during moments of vulnerability. Her willingness to engage in activities outside her initial comfort zone, like cosplay, marks observable growth. Her role consistently emphasizes kindness, reliability, and supportive friendships.