Kirin Suwabe is a scholarship-funded orphan living in Kagome Academy's special dormitory. She possesses dark skin, striking purple eyes, and shoulder-length dark brown hair typically styled in twintails adorned with ribbons, standing approximately 1.67 meters tall. Born in India but raised in Japan, Kirin maintains an intensely devoted relationship with Shinobu Handa, acting as her best friend, closest confidante, and self-proclaimed personal servant—a role central to her identity and self-worth. Her profound romantic feelings for Shinobu persist despite Shinobu's multiple partners, particularly Momoko Naitou. Kirin explicitly accepts sharing Shinobu romantically and sexually to stay by her side, engaging in daily morning kisses and frequently sleeping naked together, reflecting deep physical and emotional intimacy.

Kirin exhibits a rebellious streak, mirroring Shinobu's delinquent disregard for school rules. While accepting Shinobu's promiscuity, she experiences personal guilt during her own intimate encounters with others. Her character arc involves an evolving relationship with Matsuri Yoshioka, a girl from outside Kagome Academy who harbors deep romantic feelings for Kirin. Their relationship includes a depicted sexual encounter in the manga and anime's second episode. This bond continues beyond their school years, with official illustrations showing them holding hands while wearing coordinated maid outfits. Kirin's narrative concludes in a sustained romantic partnership with Matsuri following graduation, marking a definitive shift from her initial exclusive fixation on Shinobu.