Who is the most influencial charecter ?

I think that would have to be Abigail. She single handedly sparks the hysteria that will send so many innocent people to their deaths. She manipulates people, especially the girls around her, to basically do her bidding. By the time Abigail steals her uncle's wealth and Flees the village, Salem is reduced to a chaotic, morbid, and paranoid reflection of what these Puritans hoped it would be.