Amy Pond + violence
She defaults to violence and weaponry from the very beginning — our introduction to adult!Amy is her cricket bat — but she’s not always effective. Gradually she gets more dangerous, but doesn’t think about what that means until she kills a human* being. After that she moves away from automatic/reckless violence.*probably
This is one of the things I find most fascinating about Amy: she’s BY FAR the most casually violent companion of New Who.