The Girl with Flashy Hair, whose real name is Imika Yuhjima (夕嶋 イミカ) is a person who appears at the beginning of Mogeko Castle, sitting on the train beside the Girl with Lifeless Eyes. When her friend says that she hates trains, Flashy Hair asks if she hates buses, too. Flashy Hair thinks bikes are exhausting.
The Girl with Flashy Hair has short, black hair with red highlights. She has big red eyes. She wears a red sweater with a black star with red ribbons attached to it. She wears a white collared shirt underneath, with a red striped tie. She wears a gray skirt and red socks with black shoes.