Izumi, known as Shelly in Japanese media, serves as an administrator within the Pokémon world's Team Aqua under leader Archie. She actively participates in the team's operations to expand the oceans, aiming to create more habitats for Pokémon. During the critical Seafloor Cavern incident, Izumi assists Archie in awakening the Legendary Pokémon Kyogre. This act unleashes catastrophic weather across the Hoenn region. Witnessing the uncontrollable devastation caused by Kyogre's power, she confronts Archie, attempting to halt their plan upon recognizing its grave risks. Following the crisis, Izumi takes charge of mitigating Team Aqua's damage and works to restore balance. Her narrative arc depicts a shift from committed loyalty towards critical concern about Team Aqua's methods. This internal conflict surfaces during operations like the Weather Institute mission, where she questions the moral implications of their actions while still fulfilling her duties. This struggle culminates in her direct opposition to Archie following Kyogre's awakening. While later media features a distinct visual redesign, her core role remains consistent. Izumi also appears in a collaborative storyline involving Team Magma, where the rival groups temporarily unite against a greater external threat. Within this arc, she cooperates with allies such as Zinnia to confront manipulations targeting their teams. The available material provides no further background details like her childhood or origins.