Ookanehira is a character from the popular online simulation game and anime series 'Touken Ranbu.' He is personified as a handsome, anthropomorphized version of a historical Japanese sword. Known for his pride and confidence, Ookanehira is often referred to as the 'greatest sword under heaven.' In the series, he plays the role of a warrior who fights to protect history from being altered by malevolent forces. His character is characterized by a strong sense of duty and a competitive rivalry with other swords, especially with his counterpart, Uguisumaru.