The Sword of Logos is a mysterious organization formed by a secret sect of knights sworn to protect the Book of Ancients and keep peace in the world. Each one of the members are a swordsman of a specific element alongside their Book Spirits Partner as well as a Kamen Rider.

Merlin: The Founder of Sword of Logos and the original creators of the Seiken Swordriver and Wonder Book Ride. He is the Wizard that guide King Arthur in the Camelot Kingdom and Merlin foughts against his former apprentice and went missing after the wars has started.

Sophia: Is the ancient Mystic and co-founder of Sword of Logos alongside with Merlin, and she was former apprentice of Merlin. After her master went missing and she will bring balance of the world and finished what her master has done....

Allen: Is the Magician/Wizard in Training the Apprentice of Merlin and Sophia. He helps and guide the Riders to fight against of the Megiddo alongside the darkness. Seeing Emma as little sister.

Ray Daishinji: The mechanical and ally created the vehicles and weapons to help the Sword of Logos.

Nari: A mysterious magician witch has defected from her faction from long time ago. She says she has save by Merlin alongside with First Saber, and seeing him as big brother called him brother. She somehow has the connection with the pasts of previous Sword of Logos and the Megiddo.

(Y/N) Schwarzer: The new member and current User of Kamen rider Saber the Knight of Flame, he was adopted by the Baron of Schwarzer and unable to remember of his enemy and somehow involve the battle of Sword of Logos against the Megiddo. He and his friends will find the answer of his missing memory.

Leon Shindo: The current user of Blades/Braves, the Knight of Water he is the talented skill for swordsman. He may be serious and stoic but he has the soft and gentle side friendly to his friend.  He new student in Class VII.

Clyde Fukamiya: He is the childhood friend of (Y/N) and member of Sword of Logos and current user of Espada, the Knight of Lightning. He was happy and excited reuniting his childhood friend but stunned that (Y/N) forgotten him. And Clyde determines to bring back his childhood friend's memory. New student in Class VII

Ran Akamichi: The current user of Kamen rider Kenzan, the Knight of Wind, he has strong sense of justice and wanted to be strong. And seeing (Y/N)/Saber as his rival even through they are childhood friend and seeing Jusis, Machias and Crow as rival. New student in class VII.

Rai Ogami: He is the oldest member in the Sword of Logos, he is the Strongest Swordsman the current User of Kamen rider Buster, the Knight of Earth/Land. He is the father of his son, Sora and the husband of General Aurelia Leguin. He acgted the mentor to the young swordsmen. 

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