Fallout 3: You’re the child of a brilliant scientist and the one destined to save the world through both your own and your father’s actions.
Fallout 4: A survivor, a literal piece of the Old World that woke up to change everything. The human equivalent of a nuke in its silo.
Meanwhile in Fallout New Vegas you’re a random fuck-off mailman who stumbled dick backward into being a warlord. What’s going on? Courier 6 doesn’t know! All they know is that a motherfucker in a checkered suit shot them and stole their poker chip and now all the Mojave will feel their wrath. Their friend group is less The Avengers and more the gang from It’s Always Sunny in Philadelphia. It’s amazing.