Harry Potter and the Hidden Mystery

What if there was another young student involved in the great Harry Potter series? One that was a huge part of the story but was never spoken of? What if Harry never gave you the full story and the others didn't as well, because it was too hard on them all? Maybe there was a character that had a place in everyone's heart that saved them. A character that didn't like boundaries or stereotypes. A character that did something for the school that not even Harry Potter could match. Then none of the students could thank that person enough, that it makes them feel bad. Well let's find out....