Nanami Kanno leads the idol group Sweet Diva at 17, sharing her age with members Sakura Hagiwara and Elena Miyazawa yet exhibiting a calmer, more mature demeanor. Her long brown or dark hair and brown or hazel eyes complement the group's standard uniform. As a stabilizing force and voice of reason, she fulfills a "big sister" role, maintaining cohesion during internal conflicts. She observes emotional tensions—like Elena's struggles with Sakura's temporary departure—and mediates resulting disputes. When Sakura chooses professional wrestling with Berserk Wrestlers over returning to idol work, Nanami experiences initial shock but respects her decision.

Demonstrating commitment to group solidarity, Nanami supports Sakura's wrestling career by attending matches professionally, including guest commentary roles during broadcasts. Her leadership prioritizes collective well-being while accommodating individual growth, ensuring unity even as members pursue divergent paths.