Hotarumaru is a character from the series 'Touken Ranbu'. He is depicted as a young, cheerful, and somewhat mischievous sword warrior. Despite his childlike appearance, he is a powerful sword with a long history, originally a tachi sword that was shortened. In the series, he serves as one of the many anthropomorphized historical Japanese swords brought to life to protect history from revisionist enemies. Hotarumaru is known for his bright personality and is often seen carrying a pair of fireflies, which symbolize his name.