The Emperor of the "Hikari Club." Originally a transfer student, he joined the club midway through, but eventually replaced Tamiya as the center of the club. Triggered by a meeting with a fortune teller in his childhood, he harbored ambitions of world conquest, created the robot Litchi, and captured the beautiful girl Kanon. Since joining, he has been in a twisted affectionate relationship with Jaibo, who approached him. In "Tsunekawa-kun's Daily Life," his comical side is emphasized, such as being scolded by his mother for making litchi wine despite being a minor, or being jealous of the popular Tamiya. In daily life, he seems to be on good terms with Dentaku. He has a younger brother in his family.

Number: Eins (Number 1) He has a shaved head and a scar on his right eye. He possesses a loyalty to Zera bordering on madness, to the point where he did not hesitate to crush his own right eye and offer it to him (though unlike Jaibo, his feelings seem to remain within the realm of respect and loyalty). Including the fact that he held the title of Eins, he believed he was the most important person to Zera. His nickname "Niko" came from Tamiya telling him, "If you smiled (niko-niko) more, you'd make friends." This led to him joining the Hikari Club, but as Zera began to take notice of him, his devotion gradually shifted from Tamiya to Zera.

Number: Zwei (Number 2) Despite being a boy, his gestures and behavior are feminine, and he uses feminine speech patterns. He appears to have gender identity disorder. He is skilled at sewing, and Litchi's face and clothes were made by him. His reason for joining the Hikari Club was simply that Zera caught him and Yakob following Tamiya; he joined in exchange for being let off, and since then, he has merely supported Zera without defying his orders.

Number: Drei (Number 3) An initial member of the Hikari Club along with Tamiya and Dafu. He has a habit of biting his thumbnail. He hides one eye with long bangs, and the shadow cast over his face gives him a gloomy appearance. Raizo has remarked that he is not beautiful; far from being a handsome boy, his gloomy and introverted nature led to him being bullied by his classmate Hamazato. He has been playmates with Tamiya and Dafu since childhood. The "Hikari" in "Hikari Club" was named by taking the first initials of the real names of Tamiya, Dafu, and himself (Hiroshi, Katsuya, Riku -> Hi-Ka-Ri). He was once framed by Niko in elementary school and showed a jealous side when Tamiya became friends with Niko. In the spin-offs, he worried that the shadow on his face wouldn't disappear even if he changed his hairstyle. He is a grandma's boy and reportedly loves the rice crackers his grandmother bakes.

Number: Vier (Number 4) He has a shaved head, freckles on his face, and wears round glasses. Despite being a middle schooler, he handled Litchi's programming (Zera recognized his talent and brought him into the club), and as such, he took great pride in his skills and technical ability. He secretly harbored the ambition to house a human soul within a machine, and later destroyed Litchi's control device, contributing to the robot's rampage.

Number: Fünf (Number 5) An initial member of the Hikari Club. He always wears an eyepatch over his right eye. He has been playmates with Tamiya and Kaneda since childhood. The "Hikari" in "Hikari Club" was named by taking the first initials of the real names of Tamiya, himself, and Kaneda (Hiroshi, Katsuya, Riku -> Hi-Ka-Ri). He doesn't leave a strong impression, but he has been seen making chuunibyou-like remarks. Among the members, he is ordinary and somewhat easygoing. He has a strong interest in sex.

Number: Sechs (Number 6) The initial leader of the Hikari Club and the boy who founded it. He has been playmates with Kaneda and Dafu since childhood. The "Hikari" in "Hikari Club" was named by taking the first initials of his own name, Dafu, and Kaneda (Hiroshi, Katsuya, Riku -> Hi-Ka-Ri). He questions Zera's methods and the state of the club after Zera joined, eventually coming into conflict with him. He was originally the one skilled at slingshots and chess. He has a younger sister named Tamako who attends kindergarten. He has a stoic personality and is apparently the type to be popular with girls.

Number: Sieben (Number 7) According to Raizo's assessment, like Kaneda, he does not have the appearance of a handsome boy. He often laughs with a "hehehe." He has the weakest presence among the members. He has been good at making people laugh since elementary school, and he and Raizo are close enough to bicker constantly.

Number: Acht (Number 8) A slender, exceptionally beautiful boy with girl-like looks. He has fair skin, dark eyes, and black hair styled in an outward-flipped bob with long bangs covering his face. Following Zera's orders, his school uniform collar is always fastened to the very top.

An android created by the members of the Hikari Club over the course of a year and a half. He is a large, 220cm male-type with a somewhat grotesque, stitched-together face (in some media, he has a purely robotic appearance). Raizo produced the face mask (skin) and the costume. The name comes from the litchi fruit, which is Zera's favorite. The fruit also serves as his power source.