Star Wars: Knights of the Old Republic
The game that put Bioware on the map remains one of the biggest twists in gaming. Aside from the clichéd amnesiac hero mechanic, Knights of the Old Republic quickly sets itself apart from other narratives by crafting a story that is both compelling and influenced by the player--a mechanic that would soon become a staple of western game design.
Players are shown a world in turmoil, as Darth Malak, a former apprentice of Sith Lord Darth Revan, wages a war on the Republic. While they uncover truths about their own past and forge alliances, they are given choices that will ultimately reflect their character’s morality.
In the end, it is revealed that the player character is actually a brainwashed Darth Revan, and depending on the choices they have made throughout the course of the game, their character will overthrow Malak and continue the war against the Republic, or he will defeat him and be worshipped as a hero.
At the time, this agency over the narrative and the twist that your protagonist was actually directly responsible for the unfortunate state of the game’s world, was more than unexpected. It was revolutionary.