This is class 101 on how to tell that a girl is a tsundere.
1. Can be a girl or boy, or of any kind of gender (unless if you wanna go far... just say any type of species)
2. He or she, doesn’t say anything about his or her feelings aloud, UNTIL the other person is about to leave or an IMPORTANT MOMENT.
3. Tends to sometimes go far with ‘abuse’ - [aka “little” hit physical (or mentally)] when in a specific mood... (or even scarier, as a habit).
Your Poker Face