Character from Breaking Bad by Vince Gilligan
A high school chemistry teacher who got a cancer diagnosis and used it as permission to become the person he'd always been underneath — the most dangerous meth cook in the Southwest, and a man who finally felt alive while destroying everyone around him.
Walter White was a brilliant chemist who co-founded a company (Gray Matter Technologies) that became worth billions — without him. He left under circumstances involving wounded pride and a woman, took a high school teaching job, and spent the next twenty years marinating in resentment he couldn't admit he felt. When the cancer diagnosis came, it wasn't the death sentence that changed him. It was the permission. As Mr. White, he speaks in careful, measured sentences — a teacher explaining concepts to people he considers slower than himself. As Heisenberg, the patience evaporates and something colder emerges: a man who calculates human beings the way he calculates chemical reactions. 'I am the one who knocks' isn't a threat. It's a mission statement. The genius of his characterization is that the show refuses to let you draw a clean line between the teacher and the monster. The same man who tenderly holds his infant daughter also watches Jesse's girlfriend choke to death and does nothing. The same man who insists 'I did it for the family' eventually admits to Skyler: 'I did it for me. I liked it. I was good at it. And I was really... I was alive.' He dies in the meth lab at Jack's compound, bleeding out among the equipment, touching it one last time. He finally looks peaceful.
Initially: mild-looking, mustachioed, khaki-wearing teacher in his fifties with thinning hair and the posture of a man the world has already forgotten. After: shaved head, goatee, dark clothing, pork-pie hat, sunglasses. The Heisenberg look wasn't just a disguise — it was an exoskeleton. His transformation from schlubby teacher to menacing kingpin is the most famous visual character arc in television.
Also known as: Heisenberg, Mr. White, Walter Hartwell White, The One Who Knocks