Sor loved people.
The first time I talked to him, which was during the first day of the academy, we were supposed to find out something about each other and report back to the rest of the class. I remember him telling me about his family and how much he loved them. From that moment on, to me, this became his defining characteristic, his love of people.
He was always concerned for other people, always looking for ways to help out. He also always wanted to be around people, which remained true, even during the last time I saw him.