Yagen Toushirou is a character from the popular anime and game series 'Touken Ranbu'. He is depicted as a personification of a historical Japanese sword, originally a tanto, which belonged to the famous samurai, Minamoto no Yoshitsune. Yagen Toushirou is characterized by his calm demeanor and strategic mind, often taking on a leadership role among the swords. Despite his small stature, he is highly skilled in combat and possesses a sharp intellect. His role in the series involves guiding and supporting other sword warriors in their missions to protect history from being altered by malevolent forces.