Uehara Himari, a third-year student at Haneoka Girls' High School who moved from Class B to Class A after her first year, leads the band Afterglow as its bassist. She plays a rare Fender American Vintage '74 Jazz Black bass guitar. Standing at 155 cm, she is Afterglow's shortest member and shares this height with others in the franchise. Her appearance features medium-length pale pink hair usually in low pigtails with layered strands, fair skin, and sharp-cornered green eyes. Her casual style leans feminine with a monotone palette. Cheerful, good-natured, and energetic, Himari often acts as the band's mood maker. She coordinates activities but prioritizes collective decisions over unilateral leadership. While emotionally expressive and easily moved to tears by sentimental moments, reflecting a romantic and optimistic outlook, she occasionally misreads social situations, leading to ineffective actions or misaligned comments. Her interests include fashion trends, collecting cute items like stuffed animals despite aspiring to be seen as "cool," and comparing and baking sweets, especially chocolate and convenience store desserts. She frequently worries about weight gain, a concern exacerbated by bandmate Moca Aoba's inability to gain weight easily. Beyond the band, Himari belongs to her school's tennis club and harbors a wish to play against Misaki Okusawa. She works part-time at a fast-food restaurant and often visits Hazawa Coffee to confide in Tsugumi after hours. Academically, her performance is average. She has an older sister noted for being intimidating when angered. Himari experiences seasickness and is a devoted fan of Kaoru Seta from Hello, Happy World!; this shared interest bonds her with Rimi Ushigome, whom she befriended at cram school. Peers know her by nicknames like "Hii-chan" (used by Moca Aoba, Ako Udagawa, and Hagumi Kitazawa) and "Himarin-senpai" (used by Nanami Hiromachi). Her attempts to establish band traditions, such as the catchphrase "Hey, hey, ooh~!" or "Eiei-oh!" or creating a handmade mascot doll, are typically met with playful teasing or rejection from Afterglow members. However, they cherish her handmade lucky charms attached to their instrument cases, showcasing her sewing skills. Over time, she forged close friendships beyond her band, notably with Aya Maruyama and Imai Lisa following the "Happy Summer Vacation!" event, drawn together by shared personalities and interests.