Maruzensky is an Uma Musume character depicted as a stylish older sister type who uses outdated buzzwords. She is a speed maniac thrilled by velocity itself. Renowned for her skills, she dominates selection races and attracts many trainers but chooses her path independently. She shows maturity by comforting others without anger and acts as a senior figure, shaking hands with juniors like Special Week. She cares deeply for her real-life descendants in the story, including Sakura Chiyono O, Winning Ticket, Rice Shower, Mejiro Bright, and Karen-chan. Appears in events like Japan Cup and unit practices, though tires due to age.