Character Thesis
Your Character Thesis is a short phrase or single sentence that represents your character's strongest and deepest motivation. This motivation will shape a lot of your character's decisions and roleplay, giving you something to guide the choices you must make for the character. If your Character Thesis ever changes, or they feel it has been fulfilled, it is considered to be significant and powerful growth for your character.
Generally the Character Thesis is a broad concept as opposed to a specific goal, such as "Protect the Innocent," "Make my Family Proud," or "Be Remembered." Discuss your Character Thesis with your Gamemaster, who will ensure that your choice meshes well with the story and with the Theses of other Player Characters (it is possible, but uncommon, for two players Theses to be in direct conflict, in which case the GM will work with both players to remedy the issue). Sometimes you will tweak or adjust your Character Thesis in the first few sessions as you learn how your character fits into the story, but it's a good idea to have a general idea of your Thesis before you start.