Harry Potter has a secret.
Whenever Dali and his classmates bullied him and laughed at him for having no friends, he would retort loudly in his heart:
No, I have some very good friends! They only appear when no one is around! We play games together without letting anyone know.
Note: The stupid author's knowledge about multiple personalities all comes from movies, TV series and novels. If there is anything unscientific, please note that it is all because of magic!
Purpose: Friendship and Courage