Character from Overlord by Kugane Maruyama
A genius swordsman broken by Shalltear Bloodfallen and rebuilt by friendship — he spent his life pursuing the pinnacle of martial arts and found it in his final duel against Cocytus.
Brain's story is one of destruction and rebirth. Once supremely arrogant — a genius fighter who abandoned all human connection to chase his rival Gazef — he was psychologically shattered when Shalltear Bloodfallen caught his strongest technique with her pinky finger. He fled crying, suicidal, broken. It was Climb's simple courage and Sebas Tian's philosophy ('something made alone becomes fragile, but something made with and for others never breaks') that rebuilt him. The reborn Brain was humble, protective, and driven by bonds rather than ego. He created unique martial arts through millions of practice repetitions. His final act — challenging Cocytus on streets where he'd walked with Gazef and Climb — was not despair but joy. He placed everything into True Nail Clipper, a union of Field, God Flash, and Sixfold Slash of Light. Cocytus struck first, but honored him as a warrior. His katana became Cocytus's trophy; his body was preserved by the Frost Virgins.
Lean and wild-looking man with blue hair, brown eyes, and muscles like steel cable tempered through endless combat. Wears chainmail under his clothes and carries an unenchanted katana from the southern desert — a blade whose cutting power surpasses ordinary magic weapons through sheer technique alone. A necklace and ring provide magical protection.
Also known as: Brain, Brain Unglaus, Seeker of the Martial Arts