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The protagonist who constantly plays the fighting game Kill-Ballad and is a member of his school's robotics club. He is not interested in robots, and is only a member of the club to be by Akiho's side, as Misaki, Akiho's older sister, left her in his care before she left the island.

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An AI existing within Iru-O created by Kimijima, with another personality (Geji-nee) that is used by him to collect information.

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One of the members of the Robotics Club and a member of the school's karate club. Because of a traumatizing event in her past, she is reluctant to interact with robots.

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Creator of Kill-Ballad, and the daughter of the director of Gunvarrel. She came to Tanegashima in search of her mother.

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A second-year student in the same school as Kaito and Akiho. He won the Robo-One championship several years ago, and because of this, Akiho tries to get him to join the robotics club. However, he refuses because his father made him promise to stop playing with robots in high school and become a fish... read more

A second-year student in the same school as Kaito and Akiho. He won the Robo-One championship several years ago, and because of this, Akiho tries to get him to join the robotics club. However, he refuses because his father made him promise to stop playing with robots in high school and become a fisherman after graduating.

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The main heroine, and initially, the chairman and the only other member the robotics club aside from Kaito. She is also Kaito's childhood friend. Her dream is to finish building the giant robot Gan-tsuku, which her older sister Misaki started.

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A cheerful worker at JAXA, daughter of Tennouji Yuugo.

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Fujita is a skilled robotics mechanic who runs the Robot Clinic, a shop selling robot components which Misaki and later Akiho often visit for parts. Despite his grumpy personality, he's known to... read more

Fujita is a skilled robotics mechanic who runs the Robot Clinic, a shop selling robot components which Misaki and later Akiho often visit for parts. Despite his grumpy personality, he's known to be helpful. He's the grandfather of Junna.

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Subaru's dad: an old-school, stubborn man. He makes a living as a fisherman and is part of the Tanegashima Fishermen's union. Usually he is quiet, but he can get violent when he is angry.

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Misaki's best friend. She wears a HUG, a power-assisted suit for mobility after her legs were paralyzed.

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A teacher at Central Tanegashima High and supervisor for the Robot Club. He's former classmates with Misaki and Mizuka, and was the first president of the Robot Club. A complete muscle head, he ... read more

A teacher at Central Tanegashima High and supervisor for the Robot Club. He's former classmates with Misaki and Mizuka, and was the first president of the Robot Club. A complete muscle head, he doesn't understand scientific or difficult things. He believes there's always a way to make something happen. He gives lengthy lectures, but not in an awful way. He acts like a know-it-all and loves to offer "Pro Tips."

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Mitsuhiko's uncle and president of Space Ame company. He funds the Gan-Tsuku projects in exchange for publicity (the company name displayed on the robots).

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An executive of the Exoskeleton Company and the boss of Misaki. He always appears calm with a neutral expression. It's impossible to tell what he is thinking.

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Director of the Tanegashima Space Center and father of Akiho and Misaki.

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Misaki Senomiya is a scientist who works as a spokesperson for the company EXOSKELETON and the estranged older sister of Akiho Senomiya, as well as an old friend of Kaito Yashio. She founded the... read more

Misaki Senomiya is a scientist who works as a spokesperson for the company EXOSKELETON and the estranged older sister of Akiho Senomiya, as well as an old friend of Kaito Yashio. She founded the Tanegashima High Robotics Club and started building Gunbuild-1, which Akiho was determined to complete.

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As Vice Principal at Central Tanegashima High, Usui holds high expectations for education. She usually puts students first, but can be rather hard on those that do not match her perception of an ideal student. She feuds with the Robotics Club over its funding.

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