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For all those who have no idea what this series is about or for those who just need a review, here's all the characters!~

(Wikipedia)

Teru Kurebayashi
Teru is a strong-willed and kind girl who is alone after her older brother dies. She is left only with a cell phone that her brother gave her connects her to DAISY, who becomes Teru's confidante and encourages and protects her from afar with email messages and occasionally through physical acts. Despite never meeting him face-to-face, Teru has absolute trust in him. When she accidentally breaks a window, Teru is forced to become the "servant" of the school janitor, Tasuku Kurosaki, to pay off the window. As the manga progresses, Teru's once negative feelings towards Kurosaki grow into something more romantic. However, she grows suspicious that Kurosaki is in fact DAISY and that the phone her brother left her might be more than it appears. She is 16 years old.

Tasuku Kurosaki
Kurosaki works as a school janitor. Teru is initially unaware that Kurosaki is also DAISY, a computer hacker who worked with her brother, Souichirou, and has been entrusted with looking after her. He is often depicted smoking, drinking, and participating in violent acts, however he can be very caring towards Teru. He is described by Teru's friends to be very attractive, though he does not generally display his emotions. He is often jokingly described as a pervert and a lolicon by his friends, as it is established among his closer companions that he has strong romantic feelings for the high schooler, Teru. Kurosaki has made it his mission to care for Teru on the request of his dying friend, Teru's older brother, though recently he has chosen to protect her as his true self also. He feels that he has no right to love Teru as he is "the one that lead her brother to his death." Kurosaki is 24 years old.

Master
He is the manager of Ohanabatake, a Western style tea house, often seen wearing a bandana and apron. Both Kurosaki, Riko, and a number of characters refer to him as "Master". Despite his cordial demeanor and tendency to tease Kurosaki about his relationship with Teru, the Master can be surprising frightening; Kurosaki admits that the Master is far scarier than he is. In the past, he was a colleague of Souchirou Kurebayashi, so is fully aware of Kurosaki's activities as DAISY.

Riko Onizuka
Riko Onizuka was a member of the design team Teru's brother led as well as his girlfriend. As a result, she regards Teru as a younger sister and they live together as housemates and Kurosaki's neighbours. 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. She is also the school counselor at Teru's high school.

Kiyoshi Hasegawa
Kiyoshi is Teru's best friend and a classmate, as well as scholarship student. He attempted to find out more regarding why Teru was left so impoverished after her brother's death, despite Souichirou's reputation as a brilliant engineer. However, he ended up endangering both himself and Teru, until he is saved by Kurosaki. An intelligent boy who is able to exercise discretion, the Master reveals to Kiyoshi who DAISY's true identity as a gesture of trust. Afterwards, Kurosaki employs Kiyoshi as a second "servant" and another set of eyes to protect Teru, though Kiyoshi does not hesitate to poke fun at Kurosaki's affection for Teru.

Kazumasa Andou
The Chairman of Teru and Kurosaki's high school, Andou is a former colleague of DAISY and Teru's brother. He initially appears as the substitute janitor for Kurosaki. While he appears as a comic character who often appears from odd, small, and dark places like vents and garbage cans and enjoys being beaten up, Andou is serious whenever matters concerning DAISY arise and acts as the group's leader during investigations. His nickname, Andy, came from Souichirou.

Souichirou Kurebayashi
Souichirou Kurebayashi is the deceased brother of Teru Kurebayashi. Respected and admired as a very talented computer engineer, he led a team of engineers that included Tasuku Kurosaki and Riko Onizuka. Little is known about him, though he has been alternately shown as comically affectionate towards his sister and those he cares about to being serious and empathetic. Before his death, Souichirou supposedly developed software that was to sell for a very high price, but mysteriously disappeared. He forced the role of DAISY onto his friend Kurosaki, convincing him using some form of guilt, since Kurosaki has openly admitted that he was in some way responsible for Souichirou's death, though the contribution is unclear.

Haruka Sawaguchi
One of Teru's classmates and friends, Haruka acts as the leader of sorts in Teru's group of friends and encourages Teru's relationship with Kurosaki. She is the first friend that Teru confides in with her knowledge that she is aware that Kurosaki and DAISY are the same person. Haruka is frequently the first to come to Teru's defense at school, often leading their other friends to join suit. She is a member of the school's art club, track team, and ghost club.

Rena Ichinose
The Student Council President, an attractive girl who leads the student council to bully scholarship students like Teru and Kiyoshi and privatize school facilities and has a tendency to enter bad relationships with unsavoury men. Thanks to Teru's kindness, she gradually stops bullying and entering bad relationships. Teru becomes one of her first true friends, though Rena does not openly admit it, and indirectly tries to help Teru develop her relationship with Kurosaki.

Takuya Arai
The former information technology teacher and the system administrator of the school's information network. He was involved in a relationship with Rena and was adviser to the Student Council. However, he used his position to embezzle funds from the school's budget until Teru solicits DAISY's help in order expose Arai's corruption. Arai is fired soon afterward.

Masumi Takeda
One of DAISY's former co-workers, described as persistent, but not terribly cunning. He comes to Teru'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 Souchirou had been designing before his death. While his first attempt is thwarted by Kurosaki, Takeda choses to stop harassing Teru because of her resolve and kindness after his second attempt. He subsequently becomes an infrequent ally to DAISY.

Teru's friends
Teru's other friends includes an unnamed girl who pulls her bangs back and wears a ponytail, a helmet-hair girl and buck-teeth boy who like each other, and an overweight boy. A comical group who support one another, they are very loyal to Teru and to each other.

I don't think so... but I feel kind of special! <3
I'm the only one that's picked Riko. XD
I was going to pick Kurosaki, but then I decided I liked Riko more because... I don't know why, actually. XD

Hahaha, so that means whoever chose Teru is also special! ^.^

Eh, seriously?

Souichirou, all the way~! blaugh
he's just seems so fluffy.. as in his personality. xd

bahaha! omg, you are soo right. he's awesome~
he'd make a really.. umm.. cute girl..
LOL i can't say that without breaking down, laughing. xd

well im gonna be just like all the other kurosaki crazy girls and vote for him, cuz i mean hes slightly amazing! xd heart

Voted for Kurosaki xd I really wish that I can be in Teru's shoes sometimes, despite her unfortunate background...