The main character that undergoes some type of change within a story and grows as a result of the experience
protagonist
antagonist
indirect character
direct character

I'd have to say protagonist

Explanation: The protagonist usually goes through a change and they are usually the main character

answer: common sense was the pamphlet that thomas paine used to convince reluctant americans to abandon the goal of reconciling with britain and to accept that independence was the only option to preserve their liberty.