Itaru Washioka, operating as Heat Nana, serves as a main character. She transforms into an elemental fire warrior, commanding fire-based abilities and wielding a gauntlet on her left arm.

She radiates a happy-go-lucky, optimistic, and earnest personality. As the group's leader, she exhibits strong leadership qualities and deep care for her teammates. Her character is marked by a passionate interest in astronomy and a dream to journey into outer space aboard a self-built rocket or mecha. She presents a tomboyish, athletic demeanor, often described as hot-blooded and emotional, with occasional reckless actions. Preview materials hint at distinct persona states labeled "High" (passionate and happy), "Neutral" (her typical self), and "Low" (ghost-like and upset), though these versions remain largely unexplored.

In her civilian identity, she sports short, light brown hair with a red bow atop her head, red eyes, and typically wears a yellow flat-top hat featuring a pink bow. Her transformation into Heat Nana shifts her hair to a bright red, flame-like appearance. Her battle outfit becomes a sleeveless, predominantly pink gown with a backless design, centered by a red ruby gem.

Fragmented material reveals little regarding her background, history, family, or detailed character development. The project, initially planned for seven episodes under various directors, released only two completed episodes and teased a third. Consequently, her story arc, relationships, and broader narrative journey remain undeveloped within the existing material.