Kotomi Tsukiyama is a supporting character in The Brave Fighter Exkizer. She is a classmate of the protagonist Kouta Hoshikawa, a third-grade boy who befriends the alien robot Exkaiser. Despite her young age, Kotomi displays a notably kind and understanding nature, often showing empathy and patience in her interactions with others. She regularly spends time with the Hoshikawa family, becoming a familiar and welcome presence in their home. Her role in the story is primarily grounded in everyday life, providing a sense of normalcy and gentle companionship amidst the extraordinary events of alien battles. Kotomi’s personality is warm and approachable, and she contributes to the series’ depiction of childhood friendship and community. As a civilian schoolchild with no combat abilities or special powers, her significance lies in the quiet strength of her caring disposition and her steady friendship with Kouta and his family. The series does not focus on her personal arc or development in a dramatic way, but her consistent presence reinforces the ordinary world that the heroes strive to protect.