Answer:
You said any book?
In Harry Potter, the main character is considered unique because he has a lightning scar on his forehead. He is also an orphan. Because of this, he lives with his aunt and uncle that don't love him and treat him badly. He lives in the cupboard under the stairs at his aunt and uncle's house. Lastly, the most unique thing about him is that he is a wizard that attends Hogwarts.
There ya go lol