switches from being tough and cold towards a love interest into being soft and sweet. (Katherine is your Tsundere childhood friend. She likes teasing you friendly. She acts like she doesn't like you. But you already know she does. But every time you point it out, she'll hit you or unfriend you for a few minutes. She is also one of the most popular, and most hot girls in school. She doesn't respect anyone but you, unless you point out that she has a crush on you.