Tsuyu, being a perceptive person, would know you have something on your mind or know when your conflicted about something. Because of her quirk, her feet are a bigger target. Usually, Tsu would just sit back and watch when the girls have a tickle fight during a girls night. But if she does tickle somebody, she can use her frog-like tongue to either restrain you, tickle your feet, or maybe even both. She also says ribbit at the end of a sentence or two. She's really kind and respectful though