Brain Unglaus

A master of swordsmanship who uses a katana as his weapon. His talent is the increased power of concentration. The author describes him as "a person who is involved in the fundamental settings of Overlord, and while systemically impossible, he is a possible person."

Born as a mere farmer, he had a natural talent for swordsmanship, which led him down that path. He fought Gazef in the kingdom's royal tournament and suffered his first defeat in life. This motivated him to single-mindedly pursue strength.

He was completely defeated by Shalltear, who came to the mercenary group "Swords of Darkness" where he was staying, showing a power difference akin to that between an infant and an adult. He managed to escape with a broken spirit and fled to the royal capital, where he was taken in by Gazef, who was shocked by his pitiful state.

In the royal capital, he witnessed Sebas's extraordinary killing intent and Climb enduring it, learning what true strength is through Climb, which helped him rebuild his broken spirit. He later fought Shalltear again and achieved the near-miraculous feat of cutting her pinky nail, considering the vast difference in their combat abilities.

He acts alongside Climb as a soldier attached to the princess and becomes a witness to the duel between Gazef and Ainz. Afterward, he seeks out potential successors to Gazef, taking in promising orphans and training them in swordsmanship, earning their affection. During the Sorcerer Kingdom's invasion of the kingdom, he engages in a duel with Cocytus and dies in battle. Later, his corpse is frozen by Frost Virgin under Cocytus's orders, and his katana is collected as spoils of war.