Yumi is an energetic young woman who aspires to be the best tekkaman in the world. she admires d-boy (slade) and considers him a hero, nicknaming him "white tekkaman" and envisioning him as a valiant knight. despite her impulsive nature and emotional instability, yumi possesses significant power as tekkaman iberu. as she develops control over her abilities, she proves to be an invaluable asset, assisting blade in enhancing his combat skills during his battle against dead.