Ranko Kanzaki is a 14-year-old idol from Kumamoto under 346 Production's Cinderella Project. She has gray hair, blood-red eyes, and consistently wears gothic lolita fashion, standing 156 cm tall. Her personality is defined by pronounced chuunibyou, embodied by her alter ego Brunhilde, a half-angel, half-demon princess commanding darkness. This persona speaks dramatically in archaic "Ranko-go," filled with mythological references that often cause confusion; phrases like "Drown in the darkness!" mean encouragement, and "savor the darkness" translates to "good work." Beneath this flamboyant exterior, Ranko harbors intense shyness, social anxiety, and low self-esteem. She frequently stumbles over words or blushes when her ordinary self emerges. Initially seeking to erase this vulnerable side, she gradually accepts it as essential to her identity after realizing suppression would diminish her uniqueness. Her character development focuses on reconciling these dual identities. Early solo performances emphasize her dark persona, creating internal conflict as she struggles to communicate her true creative vision. Support from peers and her Producer helps her articulate her ideas, leading to successful projects that integrate her authenticity with her stage persona. This growth peaks during preparations for her CD debut, where she gains confidence to pitch concepts aligning with her artistic interests. She maintains private sketchbook diaries documenting her fantasies and insecurities, hesitating to share pages revealing personal feelings. Though she perceives herself as a poor artist, others recognize her drawing talent. Relationships highlight her complexity. She forms a close bond with Asuka Ninomiya in the unit Dark Illuminate, sharing gothic aesthetics and collaborative creativity; Ranko often blushes when Asuka praises her artwork. She also befriends Chitose Kurosaki in Fortuna Regina and Koume Shirasaka, who understands "Ranko-go." She admires Noa Takamine's coolness and Clarice's holiness, while sharing a dorm with Anastasia, Koume, and Syoko Hoshi. Miria Akagi uniquely interprets her speech flawlessly, enabling smoother collaborations. Her background includes an April 8 birthday (Aries), blood type A, and hobbies like drawing and reading. She favors hamburg steak, calling it her "forbidden fruit," but dislikes horror themes; despite her dark imagery, she fears ghosts and horror movies, reacting tearfully or hiding. Her speech quirks and imaginative lore, such as deriving powers from an "evil monster" linked to the Producer, underscore her escapism from social anxiety.