Shizuku Kitayama, eldest daughter of entrepreneur Kitayama Ushio and an A-rank magician mother, comes from considerable wealth. Her family maintains close ties with the Mitsui family, treating Honoka Mitsui as kin. She has a younger brother, Kitayama Wataru, whose limited practical magic contrasts sharply with her own significant inherited magical potential. Her personality is reserved and emotionally controlled, marked by a deadpan demeanor with minimal facial expressions or vocal inflection. This kuudere quality coexists with direct communication, including blunt observations and occasional merciless remarks. Despite her reserve, she shows deep loyalty and concern for friends, particularly Honoka, whom she's known since elementary school. Their relationship evolved from academic rivalry to inseparable companionship, supporting each other's magical growth. Shizuku perceptively recognizes others' values, showing no discrimination towards less magically gifted students while accurately identifying exceptional talent like Tatsuya Shiba's engineering skill. Academically, she enrolled in First High School's Course 1 (Bloom) program alongside Miyuki Shiba and Honoka. Her practical magic ranks second only to Miyuki in their year, though she struggles with theory and fine magical control. Specializing in high-output vibration and acceleration magic, her combat style prioritizes power over precision. Notable techniques include Active Air Mine, Resonance, and Phonon Maser – the latter two developed with specialized CAD programming assistance. She primarily uses a silver bracelet-type CAD, supplemented by a handgun-shaped Silver Horn CAD optimized for Phonon Maser. During her school years, she participated in events like the Nine Schools Competition, achieving first place in the Newcomers Division Speed Shooting and second in Ice Pillar Break. Her defeat by Miyuki in Ice Pillar Break profoundly impacted her confidence, revealing the vast gap in their magical capabilities. She later joined the Public Morals Committee, earning the informal title "Shadow Public Morals Committee Chief" for her behind-the-scenes effectiveness. She consistently declined formal leadership positions due to her aversion to the spotlight. Her development included an exchange program in the USNA, where she gathered crucial intelligence on supernatural occurrences that later aided in resolving Japanese incidents. Her family connections facilitated high-level logistical support, like arranging helicopter evacuations during the Yokohama Disturbance. She actively supported Honoka's romantic pursuits while maintaining sensitivity towards Miyuki's feelings, confronting Miyuki directly to clarify emotional boundaries. In an alternate continuity, Shizuku took a more proactive role during her first year, immediately intervening in campus conflicts. She demonstrated advanced capabilities like real-time magic sequence reading (Gram Demolition), dual-CAD operation, and tactical leadership during terrorist incidents at First High. This version actively investigated anti-magic organizations and negotiated with student protesters, showcasing heightened investigative and combat initiative. Post-graduation, she enrolled at Magic University while increasingly assisting her father's business ventures. She represented the Kitayama family in significant projects, including the Stellar Reactor initiative, attending high-level meetings as her father's delegate alongside Honoka. Her technical appreciation for magic engineering persisted throughout these professional activities.