Clay Jensen from 13 reasons why. He wants to solve the mystery and help the people involved, he's an amazing character.
Clay is shown to be a somewhat socially awkward person, however, he is an overall very caring, intelligent and honest person who is a good friend to those around him and a decent person. He was shown to have had a crush on Hannah Baker though was never able to tell her directly that he loved her. While he treated Hannah well and had a good friendship with her, he himself mistreated her on a few occasions such as hurting her feelings after seeing the photograph that Justin took of her that was spread around the school and coldly telling her off after she tried talking to him about Jeff's death. Clay's eventual coldness towards her was apparently so great that during her meeting with Mr. Porter, Hannah claimed that she thought Clay hated her.
In spite of this, Clay is shown to be devastated by Hannah's death and when he is given her tapes, he is shown to be horrified upon learning of the reasons why she killed herself.
About the book:
You can't stop the future.
You can't rewind the past.
The only way to learn the secret . . . is to press play.
Clay Jensen returns home from school to find a strange package with his name on it lying on his porch. Inside he discovers several cassette tapes recorded by Hannah Baker–his classmate and crush–who committed suicide two weeks earlier. Hannah's voice tells him that there are thirteen reasons why she decided to end her life. Clay is one of them. If he listens, he'll find out why.
Clay spends the night crisscrossing his town with Hannah as his guide. He becomes a firsthand witness to Hannah's pain, and as he follows Hannah's recorded words throughout his town, what he discovers changes his life forever