Changing Identity in Literature

So I would like to tie in literature to the ability for one person to change their identity. Many times in books, poems, music, short stories, movies, and other types of art, the character changes most, if not all, of their identity. For example, in the book series Divergent by Veronica Roth, the main character, Beatrice Prior, changes her identity so much, she even changes her name to Tris, so she can start fresh with a new name and identity. In the beginning of the series, she is a shy girl who wants nothing more than to be able to blend in and follow orders. By the end of the series, Tris becomes independent, wanting to stand out and be a leader. She wants to be brave, kind, smart, and everything in between. Also in this series, another character goes through major changes in identity. Tobias, also known as Four, started out in the faction Abnegation, the faction of selflessness. As a child in this faction, he lived with his abusive father. Tobias constantly lived in fear, until the day he got to choose his faction. He chose Dauntless, the faction of the brave, where they believe in standing up for those who can not stand up for themselves. As Tobias makes his transition to Four, he becomes a fearless leader, only having four fears. He stands up for those who need it, and fights for those who he loves, no matter what the cost, even if that means his life.

What other books have you read where a character went through many changes? Why do you think they changed?
Was changing a conscious effort?
Has you or someone you know went through a major change? Why did this change occur?
Do you want to change who you are? What are your fears against changing?