The Editable Backstories mod is absolutely essential for anyone that wants to flex their creative muscles and create stories that are uniquely their own. Whether it be a character that you are simply not interested in or a character you have been wanting to see implemented in the game, Editable Backstories gives you a wealth of tools to do so.
This mod allows you to edit the background of a character using XML files. This doesn't just change the narrative components of the character, but even allows you to change the way they behave based on their traits.
It's important to note that this mod erases any of the vanilla backstories a character might have, replacing it with your own. However, the creator of the mod does provide sample stories that can be used for characters if you have trouble coming up with initial ideas.