Who is Hester (Prynne) from I, Tituba, Black Witch of Salem and what is their importance?

Hester is a woman encountered by Tituba during her time in prison, having been found guilty of adultery and discovered to be pregnant with the child of a man not her husband. Defiant and determined, she urges Tituba to take revenge only on those who have directly and deliberately harmed her, as opposed to on the entire Salem community (as John Indian urged her to do). That, Hester says, would make Tituba as harsh and judgmental as those who persecute her. In that, her words and opinions echo those of Mama Yaya, who tells Tituba several times that giving in to the urge for revenge would make her no better than those who attack her.