In the Star Wars trilogy, Anakin Skywalker undergoes a personality flip to become the evil Darth Vader, as a result of a traumatic event in his life revealed in parts by the series of movies.
"Star Wars: Clone Wars: Chapter 21 (#3.1)" (2005)
Young Anakin Skywalker: I'm afraid master.
Qui-Gon Jinn: Control your fear. You are the chosen one, and you must be tested.
Young Anakin Skywalker: What's in there?
Qui-Gon Jinn: Only what you take with you. You're final test is at hand. Trust in the force.

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Skywalker Psyche

Schmitt's team describes Skywalker's symptoms, including problems with controlling anger and impulsivity, temporary stress-related paranoia, "frantic efforts to avoid real or imagined abandonment (when trying to save his wife at all costs), and a pattern of unstable and intense personal relationships," including his relationships with his Jedi masters.

Changing his name and turning into "Darth Vader" is a red flag of Skywalker's disturbed identity, note Schmitt and colleagues.

The researchers aren't suggesting that real people with borderline personality disorder are Darth Vaders-in-the-making. Skywalker's symptoms are an extreme..
Reviewed By Louise Chang, MD

Everyone in Anakin's life wants to change or mold Anakin into a different person or have a different role in life... or they want to use him as a means to an end..for their own personal or group gains...
Anakin called upon by Qui Gon Jinn at an early age to become Hero/Savior/the Chosen One/ He will bring balance to the force! He will fulfill the prophecy....
Thrust into become a Jedi/Hero..
Wins the Podrace, Leaves his Mother, Takes down a TF BattleShip almost singlehandedly..
Mentor/Master Qui Gon Jinn dies... Flawed Training from Obi Wan Kenobi..resentment, fear, Jedi vs. Self... Loses mother, Almost loses Padme.. choose between Jedi vs. Self.. Loss of Limb, Loss of Pride..
Thrust into becoming a Hero of the Clone Wars, Star Fighter Ace, Not let into the council, secret marriage, loyalty to friend vs Jedi, conflict of roles Protector vs Jedi, Vs. Self....Loss of wife, children, and best friend...
loss of humanity... filled with Rage...

What an amazing burden to put on a 9 year old child... The Chosen One!
You will bring Balance to the Force! You will lose everything and everyone you have ever loved in the journey..you will be obliterated mentally, physically and spiritually on this journey.. through the Dark Side to find him self again in his son, Luke. Fulfilling the Prophecy..of the Chosen One!
Breakdown and the Breakthrough!

Anakin Skywalker....