Nagisa Hazuki of Free! is a first-year boy who also goes to Iwatobi High School.
He is very spirited and not afraid to speak his mind. He has admired Haruka Nanase's swimming since elementary school and enrolls at his high school hoping to swim with him again. He comes up with the idea to start the swim club at Iwatobi High, and is treasurer for the club. He has a strange fascination towards the club's penguin mascot, Iwatobi-chan. His specialty is the breaststroke.
Nagisa is voiced by Tsubasa Yonaga (Japanese) and Greg Ayres (English).