Vida Kirishima is a wild, strong-willed half-vampire ninja, daughter of global swimmer Ikuya Kirishima, and manager of her twin's swim team. Though tough, she gets socially awkward around her boyfriend, Kai Natsuki. She is Mirai's best friend and Team Persona leader, becoming the superhero Stormy after inheriting a Transformation Morpher from her mother, Rei Granger, who retired to pursue music.

Kai Natsuki is a brilliant, tech-savvy strategist, swim club secretary, and teammate on Team Persona under Mirai. He is Vida Kirishima's boyfriend and Lio Fotia's friend/rival. Entrusted with the Snake Miraculous and its Kwami Sass, Kai transforms into the superhero Viperion, using the power of Intuition to help Vida on difficult missions.

Longg is the Dragon Kwami of Perfection. Connected to the Dragon Miraculous choker, she allows her current wielder, Mirai Nanase, to transform into the superheroine Ryuko.

Sass is the Snake Kwami of Intuition. Connected to the Ouroboros bracelet, he allows his current wielder, Kai Natsuki, to transform into the superhero Viperion.