Kido Tsubomi is a headstrong leader of the Mekakushi Dan, usually very strong in competence and dignity. For this, her voice must be strong and clear. It should also be noted that she is a stoic character in general, so being monotone would be a factor as well, although not sticking too much to that certain tone. Masculinity is also a great way to step ahead, but all while finding a way to capture her feminine charms, of course!