Iwatooshi is a character from the online game and anime series 'Touken Ranbu Online'. He is the personification of a historical Japanese naginata (pole weapon) and is known for his tall stature and gentle, older-brother demeanor. In the series, Iwatooshi serves as a guardian and mentor to younger sword warriors, often displaying a calm and supportive personality. His role is to protect the citadel and help defeat historical revisionists by fighting alongside other personified swords.