Childish and immature, Tatsuko has become a running gag throughout the series, usually causing her friends trouble.
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.
Ironically, she is notable to be comically resilent towards various incidents that are normally very harmful if not life threatening, usually getting away with only minor injuries.