Movie
Description
Selina Sherlock is the younger twin sister of Trinity Seven member Lieselotte Sherlock. This 17-year-old stands 155 cm tall with a slender figure (B80-W56-H82), long blonde hair in twin tails, blue eyes, and signature round glasses worn as a headband. As a student reporter for Royal Biblia Academy's newspaper club, she constantly carries a camera and exclaims "It's a scoop!" when pursuing stories.

Born into a magical family, Selina enrolled at the academy alongside her sister to study magic. Initially an apprentice without a grimoire, she specialized in Logos Art calculation magic. Her energetic personality contrasts with her Thema "Ligare" (Binding) under the Acedia Archive, enabling her to restrain targets, heal wounds by binding injuries, and manipulate temporal states through photographic imprints. Despite these abilities, her ordinary magical capabilities left her outclassed by major threats, fueling feelings of being overshadowed by her prodigious sister.

Her camera transformed into the grimoire "Archytas Replicator" when Lieselotte was endangered, awakening Selina's Magus Mode with a white combat outfit and binding-themed firearms. During a critical battle against Lugh, she intercepted Lieselotte's consciousness from a frozen dimension using her camera, binding it to her own body for temporary possession—showcasing her strategic ingenuity.

Character development unfolded across multiple arcs: captured by Demon Commander Million during the Divine Comedy arc and rescued by Lieselotte; mentored by Arbitrator Aries Chaldea to unlock access to the lost Melancholy Archive, enhancing her binding powers; collaborating with Lieselotte to seal the Giant of Nornil using their "Wonder Twin" technique Karma Number 6 and Master Number 66; and proving vital analytical skills in the final battle against the Demon Lord by completing measurements faster than Lieselotte, hinting at latent potential.

Post-conflict, Judecca recognized Selina among the few capable of wielding the Melancholy Archive, scouting her as Heavenly Arbiter of Melancholy. In the Heavens Library arc, she traveled to the celestial realm with Master Biblia and Aries to recalibrate apocalyptic predictions and prevent world collapse, though she had not yet fully connected to the Archive or the "Holy Ark" as of recent events.

Alternate timelines reveal additional context: in the Beta timeline, Selina died during a demon attack, leading Lieselotte to fuse her essence into Gleipnir until timeline corrections by Aries restored both sisters. In the Revision spinoff, a 25-year-old Selina appears as a Biblia Academy teacher with her hair in a ponytail, though her connection to the Melancholy Archive remains unclear.