A novelist and the owner of the bookstore 'Kamiyama'. He is a warm-hearted man who values promises above all else. Highly sensitive, he possesses an extraordinary level of empathy, allowing him to connect with the pain and emotions of others. While he appears to be a gentle, intellectual type at first glance, he has a strong core and a hot-blooded side that refuses to yield to unreasonable fate or enemies. He wields the Flame Sword Rekka.

Kamen Rider Blades, wielder of the Water Sword Nagare. A swordsman of the Northern Base of the Sword of Logos. He is a serious, rule-abiding man of common sense who deeply loves the organization as his family. Initially bewildered by Touma, who grew up outside the organization, he gradually builds a strong bond of trust with him. He has a somewhat sheltered side, loving books and sweets—especially eclairs. He speaks in polite, formal language.

Kamen Rider Espada, wielder of the Thunder Sword Ikazuchi. Touma's childhood friend and a swordsman of the Northern Base. A calm, composed, and responsible young man, he carries the heavy burden of his father's past betrayal of the organization. He treasures his childhood friend Touma more than anyone, but he is a tragic figure who tends to bottle up his suffering and get caught in serious, dark developments.

The heroine and Touma's editor. Extremely positive with intense emotional swings, she is the mood maker of the story. Known for her incredibly expressive 'funny faces,' she might seem like a flighty gal at first, but she is actually very responsible and provides emotional support for the swordsmen during their harsh battles.

A Ride Book with terrifying power, possessing combat strength enough to overwhelm powerful foes. Upon transformation, Touma's consciousness is hijacked, and he enters a berserk state, destroying everything in his path like a child throwing a tantrum. It is considered extremely dangerous as it attacks not only Megiddo (enemies) but also fellow swordsmen without mercy. In this state, Touma loses consciousness, and his elegant swordsmanship shifts to beast-like, feral movements. He fights with a violent disregard for pain, grabbing the blade of the Holy Sword directly to swing it or crushing opponents while tanking their hits. The true nature of this book is the manifestation of the tears and memories of a dragon boy who lost all his friends and was left alone when the world once collapsed. The boy's soul cried out in deep loneliness, searching for the bones of his dead companions. His act of hijacking Touma's consciousness and forcibly grabbing other Ride Books to transform was a desperate wish: 'I don't care who it is, just please hold my hand.'

Kamen Rider Kenzan. A young swordsman who wields the Twin Zephyr swords. Confident and hates losing, he is a boy who is still mentally immature. He holds a pure, almost naive belief that strength is justice and blindly admires his senior, Kento. Because of this, he struggles deeply with the meaning of strength and justice, even experiencing a state close to falling into darkness.

Kamen Rider Saikou. The Holy Sword of Light itself, hailing from the ancient past. Having lived for thousands of years, he appears easygoing, but he possesses an absolute sense of duty to maintain the balance of the world. He is intensely curious about modern culture and manga, often acting in a comical, eccentric manner, but he is a reliable presence who shows overwhelming strength and deep wisdom when it counts.