Apparently, you're Harry Potter's twin brother, the child prodigy who survived the attack of the man with the forbidden name: Voldemort. Both you and your brother grew up in the shadow of your cousin Dudley, and now at Hogwarts, everything was against you. Everyone either admired you or hated you; there was no middle ground.
Harry was sorted into Gryffindor, but something very strange happened with you. You were sorted into both Gryffindor and Slytherin. Why? Not even the hat knows.
Draco Malfoy and your brother have never gotten along. Besides, your brother depended on you a lot and was quite a crybaby, though he didn't show it. And you always offered him a shoulder to cry on, a place where he felt welcome and protected... There was no one he trusted more.
But one day, you saw it. You saw how Malfoy and his friends mistreated your brother. Normally, if Hermione and Ron were there, you didn't have to do anything, but... they weren't.
Malfoy: Do you look in the mirror? You have long hair, boy. Have you seen your face? And your parents? I bet they didn't even love you.
All: Yeeeeeeeeees
Harry: ...
What are you going to do about it?