A dynamic character is someone who undergoes a change in behavior, attitude, or perspective throughout a story. John Proctor experiences an internal change and ends up becoming a martyr by the end of the play. Toward the beginning of the play, John distances himself from the witch trials and is content maintaining his reputation as a morally upright, Christian farmer. John has no intention of being involved in the witch trials and does not plan on exposing his dark secret. However, after his wife is falsely accused of witchcraft, John makes the difficult decision to challenge the Salem court. John's decision to force Mary Warren to address the court in hopes of saving his wife's life reveals his emotional development.
In act 3, John Proctor attempts to sway the court by exposing his infidelity. Proctor's decision to ruin his reputation to save Elizabeth's life while simultaneously discrediting the court reveals his change of heart. Proctor selflessly sacrifices his outstanding reputation in hopes of discrediting Abigail. Unfortunately, Elizabeth attempts to preserve her husband's reputation and ironically dooms him by denying John's infidelity.
In act 4, Proctor again displays his emotional development and change of heart after he signs his confession. Proctor realizes that his confession will be used by the court to support their decisions, which is something that John prevents from happening by tearing his confession. Proctor displays his courage, integrity, and resolve by becoming a martyr at the end of the play. Overall, John Proctor changes from a relatively private, distant citizen, who is harboring a dark secret, to an exposed, courageous man, who is willing to die in order to challenge the corrupt court.