Alpha

A perfect superhuman possessing the highest intellect and combat abilities among the Seven Shadows. Ages 13 to 15. Often serving as the de facto leader, she is respectfully addressed by the other Seven Shadows, and generally referred to with honorifics when addressing Shadow, though there are exceptions. She interacts more casually with Shadow than with the other Seven Shadows, being the only one who calls him by name. She holds deep affection for all the Seven Shadows, considering them family.

She possesses sword skills second only to Shadow, and has developed her own version of his techniques, which she teaches to the members through Lambda in an easy-to-understand manner.

Her body was grotesquely disfigured due to demonic possession, and while being transported to a church, she was attacked by bandits and taken to a deserted village. There, disguised as the stylish bandit slayer, Shadow attacked and annihilated the bandits. After finding her, Shadow used her as a test subject for magic control experiments, which ultimately cured her demonic possession and restored her body. This incident, where she vowed to repay her debt, led Shadow to involve Alpha in a pretend game of power within the shadows by fabricating the story of the Diabolos Cult, marking the beginning of this tale.

After hearing about the Diabolos Cult, she started bringing others afflicted with demonic possession and gradually incorporated them into the Seven Shadows. Following the Claire kidnapping incident, she dispersed with the other Seven Shadows and treated people who, like her, were possessed by demons, recruiting them as members of the Numbers and others, around which the organization Shadow Garden grew immensely without Shadow's knowledge.

By conducting her own investigations and verifications, she became convinced that the fabricated settings and the "Wisdom of the Shadows," which Sid referred to as knowledge from before his reincarnation, were true. She places her utmost trust in Sid both personally and professionally. Therefore, she shows no mercy to anyone who harms Sid, and she seems somewhat concerned when it involves women like Alexia. Her emotional stability was significantly disturbed when he temporarily defected during the Mitsugoshi siege, showing her dependency on Shadow. Even when discussing her food preferences, she speaks not of the taste or texture, but of her experiences related to Shadow.

She is actually a descendant of the hero Olivier, and she resembles him and another descendant, Beatrice.

In "Shadow Tactics! Second," when she plays instruments like the piano, the pitch inexplicably shifts to an impossible range for normal instruments. Also, when asked to design for the Mitsugoshi brand, her designs oddly incorporate animal patterns, highlighting one of her few flaws in the artistic domain.