Hidan no Aria: Shiden no Majo

神崎・H・アリア

Aria Holmes Kanzaki (神崎・H・アリア, Kanzaki H Aria) a.k.a. Sherlock Holmes IV is the main female protagonist and title character of the Hidan no Aria series. She is a female transfer student of Butei High School. An Assault department S-Rank Butei, who wishes to recruit Kinji Tohyama as her partner after their initial encounter to defeat the IU and exonerate her mother. Over the course of the series, she falls in love with Kinji, although she has difficulty expressing it due to various factors as well as her personality.

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峰理子

Riko Mine Lupin IV is a female student at Tokyo Butei High School, former operative of IU, and member of Team Baskerville. Despite being a Rank A in the Inquesta department, she's ironically known as the biggest idiot of her class due to her constantly sleeping during lectures. However, she lives up to her rank by procuring and providing the most reliable information from the school's underground information networks in addition to keeping tabs on every student in the building.

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遠山キンジ

星伽白雪

Shirayuki Hotogi (星伽 白雪, Hotogi Shirayuki) is a female student of Butei High and a childhood friend of Kinji Tohyama. Currently, she is Tokyo Butei Academy's student council president in addition to other clubs and an A-rank member of the academy's SSR department. Using the Hotogi Arts, she is able to control flames and has a natural affinity for divination and fortune telling.

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レキ

Reki (レキ; 蕾姫, Reki) is an S-rank Butei Snipe department. Her real name is unknown and is shown to be habitually taciturn, constantly impassive, indifferent in fashion, and almost always found wearing her headphones. Reki at start of the series was shown to be emotionless earning the nickname "Robot Reki." However, throughout the course of the series from her interactions with Kinji Tohyama, she starts to develop emotions, which she shows Kinji by smiling at him and falling in love with him as well.

Bio from Fandom, licensed CC BY-SA