Kogarasumaru is a character from the game and anime franchise Touken Ranbu Online. He is the personification of the legendary Japanese tachi sword, Kogarasumaru, brought to life to fight evil spirits known as the 'History Retrograde Army'. As a sword warrior, Kogarasumaru serves as a wise and dignified presence among the Touken Danshi, offering guidance and strength to his allies. His graceful and refined demeanor reflects his origin as an ancient and revered blade, making him a beloved figure in the series.