Personally, I think Elizabeth has the greatest potential for change. She is in an untenable position, chastizing her husband yet desperate for some kind of affection. She has been cheated, which makes her mean, but she is not mean by nature. She is simply hurt and acts out of that hurt.
When she heals, she will change. That's my thinking anyway.
Both Abigail and John are characters who are likely to undergo changes, based on many things. It is the Reverend Parris, though, who seems most likely to change. The primary reason for that, of course, is fear. He is afraid people don't or won't respect him, he is afraid people will blame him for what is happening to the girls, he is afraid his niece has brought shame on his family, he is afraid his servant is involved, he is afraid the powerful landholders in his church will...
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lose faith in him. Because of these fears, Parris spends his time trying to please some people and trying to hide any potential culpability. Both of these require that he say, do and accuse whoever he needs to at any given moment. Parris stands for nothing and shifts like the wind whenever necessary. That is the only consistent thing about him.
I think that you can also identify Abigail as someone who has the potential for change. You can see that Abigail does have a great deal of charisma because she is able to bend the girls to her will. But you do not know what she is going to do with that charisma. We know that she will use it to keep herself from getting into trouble. But in the third scene, we get the idea that she will use it for something more--to incriminate others. We do not know at this point where this will lead and how far she will take it. Because of that, she has the capacity to change in either direction as the play goes on.