Well, since I'm not sure which 'woman in the well story' you specifically refer to, generally speaking, the main character is the woman who is in the well. She is the focus of the story as she is the one in the difficult situation and her actions and experiences drive the plot.
If it's a traditional story, the woman in the well is the central figure. She might be a normal village woman who was going about her day and then this unexpected event of falling into the well happened to her. Her character traits such as her courage, or her ability to stay calm in a scary situation are what make her the main character. She is the one that the readers or listeners are most concerned about, wondering if she will be rescued or how she will survive in the well.
The main character is the woman, of course. She is the one associated with the well, and the story likely revolves around her actions, her experiences at the well.
The woman at the well is also a main character. She is from Samaria and has had a troubled life. Her interaction with Jesus is what the story is largely about. Through her encounter with Jesus, she undergoes a transformation and becomes an example of someone who is redeemed and changed for the better.
She was a Samaritan woman. In that society, Samaritans were looked down upon by the Jews. She was in a rather difficult situation in life. Her multiple marriages and current living situation made her a bit of a social pariah. But she was the one who had this life - changing encounter with Jesus at the well.
The woman is the central character in this story. And perhaps there are other villagers who are indirectly part of the story. For example, they might be the ones she has had relations with before, or the ones who will be affected by her transformation. There could also be a spiritual figure, like an angel or a divine messenger, who plays a role in her encounter at the well.
In the 'the woman in the well story', the most obvious main character is the woman trapped in the well. She is the one whose situation drives the story. Then, there could be characters like the person who first hears her cries for help. This could be a child playing nearby who then tells the adults. There may also be a local authority figure who is involved in the rescue efforts, like a sheriff or a police officer in some versions. And if there is a mystery behind her being in the well, the person or people responsible for her situation are also important characters in the story.
The main characters are Jesus and the woman. Jesus, as the Son of God, approaches the woman at the well. The woman is an interesting character. She is at the well alone during the heat of the day, which might suggest she was an outcast. Their interaction forms the core of the story.
The woman at the well was a Samaritan woman. In that society, Samaritans were often ostracized by the Jews. She had a rather complex life, having had multiple husbands and was currently living with a man who was not her husband.
The woman in the story was a Samaritan woman. She had a rather complex life situation. She had been married five times and was currently living with a man who was not her husband at that time.
She was a woman with a rather complicated personal life as she had been married five times and was currently living with a man who was not her husband. But Jesus didn't condemn her for her past or present situation. Instead, he engaged in a conversation with her that led to her spiritual awakening.
The main characters are Jesus and the woman at the well. Jesus is central as he initiates the conversation with the woman and offers her 'living water'.