Asahi Shiina is currently a university student at Hidaka University where he is a member of the Hidaka University Swim Club alongside Haruka Nanase and Seijuro Mikoshiba.

Makoto Tachibana is the backstroke swimmer and former captain of the Iwatobi High School Swim Club. Currently, he is a university student majoring in sports medicine at Meijo Chuo University, in Tokyo, with the aim of becoming a professional sports trainer.

Haruka Nanase is a freestyle swimmer and was vice-captain of the Iwatobi High School Swim Club. He is currently a university student at Hidaka University where he also a member of the swim club while pursuing professional competition on the global stage.

Aoi Ichijou, the "World's Strongest Samurai," is a member of the idol group ST☆RISH and the girlfriend of elite swimmer Haruka Nanase. Scouted by half-vampire musician Rei Granger, Aoi wields the Dragon Miraculous and the kwami Longg to transform into the superhero Ryuko, using the power of Perfection to assist Rei on dangerous missions.

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