Games

This is why I loved Morrowind. You "become the chosen one" by fulfilling peoples' expectations of what the chosen one is supposed to do; doing becomes being. But ultimately, you are an ex-convict press-ganged into an imperial spy network taking advantage of the fact that you fit the only criterion no one could change: date of birth and starsign in accordance with an ancient prophesy believed by the autochthonous peoples of the land where the Big Bad is amassing his power (posing a threat to imperialization).

The actions you take to convince people of your chosen one status include: bribing politicians, killing politicians for other politicians over petty grievances, contracting an incurable disease and then being a guinea pig for a dangerous alternative medicine, sex trafficking (with a non-sex-trafficking option made available by the modding community), grave robbing, and aiding a religious schism.

But this is just the quests you complete and the conversations you have that point you in the direction of the end goal. You don't have to actually fulfil any prophetic criteria or convince anyone to anoint you savior to kill the Big Bad. You just need to find the two magical artefacts to counteract his doomsday machine--and you can stumble upon the in-game texts that describe their locations and significance.