Yuna Yuki is the main protagonist of the anime series 'Yuuki Yuuna wa Yuusha de Aru', also known as 'Yuki Yuna is a Hero'. She is a second-year middle school student who is cheerful, energetic, and always willing to help others. Yuna is part of the Sanshu Middle School Hero Club, a group dedicated to assisting those in need. Her life takes a turn when she is chosen to become a hero, tasked with protecting the world from mysterious beings known as Vertexes. As a hero, Yuna demonstrates great courage and determination, embodying the spirit of friendship and self-sacrifice to protect her loved ones and the world.