Psychologist Brene Brown wrote, "Vulnerability sounds like truth and
feels like courage. Truth and courage aren't always comfortable, but
they are never weakness."
In most dramas, there is at least one character who the audience can relate to in the clearest sense of being vulnerable. It helps enhance the "fear" factor viewers see when that character has to confront uncomfortable situations.
Who were the weakest characters on LOST? And did the audience gravitate toward them in an empathetic way?
Clearly, Hurley was a fan favorite. His back story of being a loner, overweight, not popular pulls on the heartstrings of most people as they themselves probably experienced similar things during their childhood. Even the demanding but loving stereotypical mother put context in how Hurley retreated into himself (to the point some say into mental illness.)
But when he won the lottery, most people believe he would have changed his personality because wealth solves most problems in life. But in reality, 90 percent of all major lottery winners lose it all within five years of winning. Most can't handle the money or fame. They spend without thinking. They are taken advantage of. Many families get torn apart. They regret ever playing the game.
The only significant change to island Hurley was that he was more open and social with the people around him. He felt comfortable in being the nice and funny guy in the group. But he kept the barbs and uncomfortable secrets about his past hidden. He did not want people to know he was a loser. He wanted to fit in. And in the beach survivor camp, he did fit in. As a follower. He did not want to face danger. He did not want to be a leader. He just wanted to make friends. The only time he went out-of-character was saving his friends from the Others by running over the bad guys with his van.
In the end, it is still not clear whether Hurley did change. His relationship with Libby may still have only been an illusion (from his days at the mental institution).
Locke had a different kind of weakness. He did not know his own limitations. He wanted to be a great man, a leader, and adventurer. But he washed himself of his one asset, his intelligence, in an attempt to become a popular-jock character. But he was never good at that. He was lanky, awkward and not very social. He moved from foster home to foster home so he could never learn how to make and maintain friendships. His lack of a real family caused him mental anguish to the point where his imagination took over reality in a quest to find his new family. It led him to a cult only to be betrayed as a stooge in a drug running operation. On the island, he started off as a father figure - - - a provider of food. But simple jealousy with Jack's quick ascension to the leadership role doomed any level of friendship between the two. Locke felt Jack was his rival; but Jack could care less about Locke.
Locke sought appreciation and acknowledgement with the enemy, the Others. He was too narrow minded to realize that he was being manipulated by Ben and Widmore to do their bidding. Once a fool always a fool. Locke died a foolish death at the hands of Ben. But the island inhabitants did not feel a great loss (even though a drug induced, panic stricken Bearded Jack used it as motivation to return to the island). Locke's image, as Flocke, after taking over his body by MIB was the only time that people listened and feared him. But again, that was an illusion. The real Locke had no dreamlike victory he sought his entire life.
In the end, it was clear that Locke's fate was always to be alone. He was with the island people in the church, but he was by himself in the pew.