- Kazuya Kujo (久城 一弥 Kujō Kazuya)
- Voiced by: Miyu Irino (Drama CD), Takuya Eguchi (Anime)
- The main character of the story. As the youngest son of a soldier, Kazuya has spent most of his life struggling with living in his highly successful siblings' shadows. Jealous of all the attention his brothers got, he worked hard to compete, but everything changed when he understood that adults, who think that the youngest child is always spoiled and useless, will never acknowledge his efforts. With a permanent scar in his heart he left the military academy in Japan and before anyone from his family could stop him, went to study abroad to St. Marguerite. Unfortunately, his appearance, combined with the student body's belief that "the traveler who comes in the spring brings death with him" has resulted in Kazuya being called the "Reaper" and having no friends. By some twist of fate he becomes a messenger and companion to the most eccentric pupil in the school, Victorique. At first he didn't like Victorique because of her arrogant attitude, but after some time he started to care for her and be protective of her. It is shown that he is willing to risk his life to protect her on more than one occasion. He is described, by Victorique, as a good and sincere person whose soul is pure and beautiful enough to admit pride. Although he claims to have good academic achievement higher than his older brothers, he can be very dense and slow which is quite contrary. He does have admirable fighting and athletic ability however. It can be assumed that while Kujo has a good memory, he is not good at being creative or applying inteligence to real life. He has to rely on Victorique too much for explanation for even simple things. Despite everything that happened in Japan he is proud to be a soldier's son.
- Victorique de Blois (ヴィクトリカ・ド・ブロワ Vikutorika do Burowa)
- Voiced by: Chiwa Saitou (Drama CD), Aoi Yūki (Anime)
- The heroine of the story. Victorique has the appearance of a small (4'7"), almost doll-like, girl with long golden hair and emerald eyes and a voice that sounds exactly like that of an older woman. Another important part of Victorique's appearance is a pipe that she smokes when thinking about something; though in the anime, it is never shown to be lit or showing her smoking due to her young age. She spends her days at the conservatory at the top of the library, reading several difficult books, often in different languages, simultaneously. She points at one wall of the library and has told Kazuya that she has read almost all the books over there. Along with her sharp tongue, abusive bluntness and eccentric attitude, she possesses amazing detective skills. After Victorique saves him from a near-arrest, Kazuya finds himself being entangled in every new mystery. Because her mother was a mistress, and according to Victorique "a dangerous person", she was imprisoned in the depths of the de Blois mansion where she developed very un-childlike mannerisms. She was sent off to school under strict orders to never leave the campus (although Grevil sometimes obtains special permission to take her out). When she first met Kazuya she didn't like him and thought that he was annoying and stupid for climbing up all the stairs in the library. She even ignored him and made fun of him, but gradually warmed up to him and began to trust and cherish him. Despite acting harshly towards Kazuya at times, it's clear that she cares deeply for him, as seen any time he is in danger. She enjoys "reconstructing chaos" by solving intricate mysteries and often complains of the boredom that causes her headaches. Her mother is from the legendary "Village of the Gray Wolves", a secluded castle inhabited by people with golden hair, green eyes, small figure, and rosy cheeks, just like her, and despite her mother being expelled from the village after being accused of murder, Victorique believes in her innocence.
- Victorique's name is spelled "Victorica" on the official Gosick website. Her name is spelled "Victorique" in the first two novels (English translation) and in episode 9 of the anime. All evidences in the novel are that Sauville, the academy and Victorique's family all speak French as their first language. Victorica probably signs her name with the French spelling, "Victorique". In the novels, it is noted that her name is apparently usually a man's, as Avril initially does not believe Victorique is a female student when she is being discussed.
- Grevil de Blois (グレヴィール・ド・ブロワ Gurevīru do Burowa)
- Voiced by: Takehito Koyasu (Drama CD), Hidenobu Kiuchi (Anime)
- Grevil is an aristocrat who had forced the local police to make him a detective purely because he had an interest in crime. The most noticeable thing in his appearance is his drill-like hairstyle that Kazuya thinks could be used as a deadly weapon. Despite being a terrible detective and always having to rely on Victorique to solve his crimes, he usually refuses to acknowledge that she even exists. When he comes to the library he speaks about the case that troubles him to Kazuya, saying that it helps him to clarify his thoughts. Kazuya tries to get him to tell it to Victorique, which he ignores. Victorique tells Kazuya to chat with the detective, that she will just read her books; if she says anything to herself, pay no attention. This is because he is Victorique's half brother and even if they are family they could never acknowledge each other in public. He has however been shown to care for her and is implied to have become a detective and ignore Victorique in order to cure her boredom and care for her behind their father's back. His mother was their father's proper wife and because he is the eldest son he takes all the glory for solving crimes and will take over after their father dies. He is described by Victorique as a heel and a playboy. It is revealed that he is in love with his childhood friend Jacqueline and helped her with her previous case. His drill-like hairstyle is the price for making Victorique solve the case but says that the real price was for him to stop loving Jacqueline.
http://en.wikipedia.org/wiki/Gosick
