She uses her great strength to deal with anyone who troubles her or her friends.She easily hits anyone who annoys Orihime or gives her some sort of deep personal insult, seen when Kon, while inside Ichigo's body, gives her a compliment and apparently kisses her on the cheek.They haven't had a single karate match since the day Ichigo beat her.Ichigo also used to call her Tatsuki-chan, but stopped in the 5th grade.Her hair used to be short and dark, kept spiked out at the sides, in tune with her less than feminine appearance.She usually appears in her school uniform or her karate outfit while training in school or at the dōjō.After that, Tatsuki promised to protect her from anyone who dared to make her cry, and she and Orihime became best friends. They first met when they were 4 years old, at the dōjō where Tatsuki used to train.She claims to be the first person to make Ichigo cry at the dōjō, with one blow to the upper body, which made Ichigo cry in about 10 seconds. Tatsuki routinely beat Ichigo until sometime in the 6th grade.
As Tatsuki and Orihime are walking to their homeroom, Orihime knocks into Ichigo Kurosaki, and drops all of her books.
She stays angry for some time, even after wrecking much of the classroom and Kon flees the scene. When they were children, Tatsuki regularly saved Ichigo when he was getting beaten up, as well as cheering him up when he was upset.
A tomboyish karate practitioner with dreams of becoming a vale tudo champion and already ranking Japan's second strongest in her age group, her only obvious feminine trait is how she writes her name using hiragana (たつき), though this is because she thinks it looks feminine while she considers the kanji of her name to be unappealing.
Their conversation is then interrupted by Michiru, who notes that Ichigo might not come to school today.
The two are confused and ask what Michiru means since he always comes to school with Ichigo.
Tatsuki asks Ichigo why he was late for lunch, but he tells her not to worry and that he will tell her about it later.