Harry Potter is the main character who was brought up by his evil uncle and aunt, but ended up very happy with his new friends. He has a quest though to make sure the evil wizard gets payback.
Hermione Granger was raised by her non-magical family, but ends up helping Harry and becoming his friend and helps him in his quest.
Ronald Weasley was born and raised a wizard and helps Harry and Hermione and becomes their friend, and helps in Harry's quest.
The evil wizard was killed Harry's mom and dad, so now, Harry wants to get him put in jail, and Harry succeeds.