Dengeki Daisy

黒崎祐

Tasuku Kurosaki (黒崎 祐, Kurosaki Tasuku) is the 24-year-old main character of Dengeki Daisy. He's a school custodian at Teru's school, who forces her to become his "slave" after she accidentally breaks a school window. It is also later revealed that he is DAISY, the anonymous person who's been sending her emails through a phone that her brother gave Teru before he died.

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紅林照

Teru Kurebayashi (紅林 照, Kurebayashi Teru) is the 16-year-old main character of Dengeki Daisy, who is a scholarship student at her high school because she can't afford the tuition and the younger sister of Soichiro Kurebayashi, who was an expert computer programmer until his death.

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紅林奏一郎

アキラ

Akira (アキラ) is a mysterious and eerie boy who seems to possess an uncanny resemblance to Soichiro, Teru Kurebayashi's older brother. However, as a number of characters note upon seeing Akira clearly, he does not actually resemble Soichiro that closely. To conceal his appearance, he wears a hoodie.

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鬼塚理子

Riko Onizuka (鬼塚 理子, Onizuka Riko) is the 30-year-old supporting character in Dengeki Daisy. She works as school counselor at Teru Kurebayashi's high school and Riko was a former member of the design team that Soichiro Kurebayashi led. As a result, she regards Teru as a younger sister and they live together as housemates and Tasuku Kurosaki's neighbors. Riko is friends with Kurosaki and often subtly serves as his adviser on his situation with Teru, frequently teasing him or acting violently toward him if she thinks he has acted inappropriately towards Teru.

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沢口遥

Haruka Sawaguchi (沢口 遥, Sawaguchi Haruka) is one of Teru Kurebayashi and Kiyoshi Hasegawa's classmates and friends, who often acts as the leader of sorts in Teru's group of friends. She encourages Teru's relationship with Tasuku Kurosaki with sincerity and humour, being generally unafraid to say things that Teru is too embarrassed to admit. She is the first friend that Teru confides in with her knowledge that she is aware that Kurosaki and DAISY are the same person.

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森千春

Chiharu Mori (森 千春, Mori Chiharu) is introduced as the sexy but airheaded school nurse, who frequently makes thinly veiled backhanded insults at Teru Kurebayashi, in which Tasuku Kurosaki becomes suspicious of Mori when she tries to use Teru to expose DAISY, suggesting she is more dangerous than she appears.

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安藤数正

Kazumasa Andou (安藤 数正, Andō Kazumasa) is the Chairman of Kagamiyama Private High School (私立鏡山高校, Shiritsu Kagamiyama kōkō), the high school which Teru attends and where Kurosaki is employed. A former colleague of DAISY and Teru's brother, Andou was an elite programmer on par with Master's degrees and Doctoral degree level experts and remains extremely knowledgeable with coding and programming.

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増田

Masuda (増田), commonly known as Master by most of the characters in the series, is a close friend of Tasuku Kurosaki and will help him out whenever he's in a tight spot. He has known Kurosaki for a very long time and enjoys teasing Kurosaki often. Master is also an essential member of the "Team" that devotes itself to protecting Teru Kurebayashi.

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竹田真澄

Masumi Takeda (竹田 真澄, Takeda Masumi) is one of DAISY and Soichiro Kurebayashi's former co-workers, described as persistent, but not terribly cunning. He comes to Teru Kurebayashi's school as the new PC instructor and administrator for information management, but in truth hopes to get close to Teru to obtain her cell phone, believing it contains unreleased software Soichiro had been designing before his death. While his first attempt is thwarted by Tasuku Kurosaki, Takeda approaches Teru again and believes that he has successfully tricked her into letting him scan her cell phone. When she reveals she was aware of his intentions and encourages him to share any discoveries he makes regarding her phone, Takeda realizes the strength of Teru's resolve and her kindness and chooses to stop harassing her, despite orders from the organization that demanded he do so.

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