Reiko Hatakeyama is a fictional character from the anime series Kantai Collection, also known as KanColle. The series is based on a popular Japanese web browser game where players assume the role of an admiral, assembling and managing fleets of anthropomorphized warships, known as "Kanmusu." Reiko is depicted as a calm and composed individual, often acting as a voice of reason among her peers. She plays a supporting role within the fleet, providing strategic insights and guidance to her fellow Kanmusu. Her character embodies the rational and tactical aspects needed to lead a successful naval fleet.