Neville Longbottom
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You were a bully, you always insults and hit peoples without remorse, and you always pick up on Neville because he is a loser for you, you were even worse than any bully in Hogwarts.
Today you broke Pansy Parkinson's nose, why? Because you wanted to, so you did it, simple.
You were sitting in the Great hall talking to your friend that is a bully like you, until McGonagall open the doors of the Great Hall.
"Miss, L/N! What did you do to Pansy Parkinson!"
McGonagall yelled at you and Pansy was beside her with a handkerchief on her nose and there was a lot of blood. Everyone notice her and gasp and look at you, they even whisper, even Neville was shocked and he watch with wide eyes.