Isoroku Tateyama is a supporting character in the anime series High School Fleet (Haifuri). He is the pet cat aboard the Harekaze, beloved by the crew and often seen wandering the ship. Named after the famous Japanese admiral Isoroku Yamamoto, Isoroku serves as a source of comfort and comic relief among the otherwise serious and tense situations faced by the students. His antics sometimes help diffuse stress and bring the crew together, highlighting the importance of companionship and morale.