Selina Sherlock

17 years old, height: 155 cm, measurements: B 80/W 56/H 82. Her specialty magic is numerology, the same as her sister. Her "archive" is Sloth (Acedia), and her theme is Binding (Ligare). The grimoire she possesses is the "Copy of Architas."

She is the twin sister of Lieselotte, a girl known for her glasses (reverse nylor) used as a headband and her twin tails. She is a member of the newspaper club and is always on the lookout for scoops with a camera in hand. Due to her diligent efforts alongside her sister, she has excellent grades. In contrast to her sister, her bust size is modest, which Arata describes as "convenient size." At the beginning of the story, she was an apprentice mage without a grimoire.

In the battle with Lugh, she successfully "stopped" the "super-speed world" where her sister was with her camera, binding her sister's consciousness to her own body. Even after Liese returned to the real world, she continued her research diligently. During the Great Magic Research Battle, her strong will to rush to Liese's aid allowed her beloved camera, which was a magic tool, to qualify as a grimoire. Simultaneously, she gained Magus Mode and the official class of a mage, showcasing her prowess by repelling the assassins sent by Anastasia alongside Liese.

In the Divine Gate arc, she expressed her desire to accompany Arata in place of Liese, who had once again disappeared. Although the condition from Biblia was to escape immediately if things got dangerous, she had raised her abilities to the point where she was actually granted permission. Later, she was kidnapped by the Twelve Demon Generals' Milione and was about to be consumed along with her magic, but was rescued by Liese, who had devised the manifestation attire "Belphegor." During the final battle with the Demon Lord, she focused on measurement and analysis from the rear, and at one point, she completed the measurement slightly ahead of Liese, showing a glimpse of talent that rivaled her sister, a member of the Trinity Seven.

Upon returning to the academy after the battle with the Demon Lord, she was told by Judeca that she possessed "a very rare talent." True to those words, it was soon revealed by Aries, who appeared before the sisters as an arbiter, that she was the only one with the aptitude for the lost archive (Cavum) of Melancholy.

In the new chapter, she was scouted for the position of "Heaven's Arbiter" of Melancholy from the celestial realm, but as of now, she has not succeeded in connecting to the "archive" or the 'Holy Ark' of Melancholy. After Arata went to the Black Emperor Flame Realm, she visited the celestial realm with Biblia and is spending her days researching with Aries to re-measure the future to prevent the world from collapsing and her sister from disappearing due to the revival of the "Goddess of Deep Darkness."

"β Space-Time" Selina Sherlock

During a past magical incident, the sisters chose to "return to the mansion to check on the hidden 'something'," resulting in their deaths at the hands of the attacking demons. At this time, Liese managed to survive without realizing she was dead by mystically fusing with the Gleipnir she acquired, but in reality, at this point, it was merely "mythical armament mimicking Selina's personality."

When Liese from the main story's space-time tried to finish her off in the β space-time, she intervened and took the blow from Dáinsleif, wishing for her sister to be freed from her death, and returned to being just a mythical armament. However, it seems that the theme of Binding (Ligare) and Selina's own will remained. Ultimately, in the world after Aries repaired all space-times, her sister, who had obtained Gleipnir in advance, defeated the demons, allowing her to survive safely.

"Revision" Selina Sherlock

In the spin-off "Trinity Seven -Revision-," she appears as a teacher at Biblia Academy, supporting the protagonists. She is characterized by her long blonde hair tied in a ponytail, and her physical age is 25.

She shows a more mature appearance than in the main story, but it is not clear whether this work corresponds to the future of the main story or is a tale of a parallel space-time. It is confirmed that she is a mage of Sloth who has mastered numerology, but whether she possesses the aptitude for Melancholy as in the main story remains undisclosed.