Marimo Nishikawa is a young kindergarten student and a supporting character in the anime Bad Girl. She serves as the Head of Personnel within the ADC, a fan organization whose name stands for Atori-sama Daisuki Club, a group of devoted followers of the school’s idol, Atori Mizutori. In her everyday interactions, Marimo appears calm and composed, but this exterior shifts dramatically when the topic of Atori arises. At that moment, she reveals an intensely devoted and sadistic fangirl side, displaying an obsessive passion that contrasts sharply with her usual demeanor. Her role in the story is tied to the ADC’s activities and its interactions with the protagonist Yuu Yuutani, as the club often intersects with Yuu’s own attempts to gain Atori’s attention. Marimo is part of a group of kindergarteners who run the ADC with surprising organizational skill, and her key relationships include fellow members such as the club’s head, Maria Komari, and other kindergarteners like Momiji Kaname, Aoi Aoyama, Rin Mouri, Nana Matsuda, and Yume Izumi. As a supporting character, she provides comic relief through the striking contrast between her innocent appearance and her fervent, almost extreme admiration for Atori. Her notable ability is her capacity to switch from reserved and collected to passionately vocal about her fandom in an instant. Visually, she has dark brown hair and pink eyes. No detailed background or specific development arc is available from the existing information, and her motivations revolve around her unwavering devotion to Atori and her role within the ADC.