Childish and immature, Tatsuko has become a running gag throughout the series, usually causing her friends trouble. As the daughter of a family dojo, she highly respects her brothers and father for their strength.
While Tatsuko carries the overall stature of an elementary school student she is considered the weakest among her fellow classmates and friends.
Despite being the daughter of martial art dojo, she is rather feeble, untalented in physical abilities and usually causes more harm no matter her intentions. This also conveys how she is not really atheltic in sports such as dodgeball.