Well, Fallout 3's story is great for those who like a more personal and somewhat linear adventure. The main character has a clear goal from the start - find dad. The worldbuilding in Fallout 3 is also quite good, but it mainly serves to support this central story. In Fallout New Vegas, the story is a complex web. You start as a Courier who gets caught in the middle of a huge power struggle. There are so many different paths you can take depending on which faction you side with. Each faction has its own ideology and goals, and your choices really shape the outcome of the story. It offers a much more immersive and replayable story experience than Fallout 3.
The story of Fallout 3 is set in a more desolate and depressing Capital Wasteland. It's mainly about survival and the search for the protagonist's father. Meanwhile, Fallout New Vegas has a story that is more about politics and influence. The Courier has to deal with different groups like the NCR, Caesar's Legion, and Mr. House, and their different ideas of how to run the Mojave Wasteland. This makes the story of Fallout New Vegas more complex and less centered on a single personal quest like in Fallout 3.
One great RWBY Fallout New Vegas fanfic is 'Desert Rose' which combines the unique settings of both universes really well. It has interesting character interactions and a captivating plot that keeps you hooked from the start.
You could write a fanfic about the origin of one of the factions in Fallout New Vegas. Let's say the Powder Gangers. Maybe they were once just a group of miners who were mistreated and decided to take up arms. Show how their ideology evolved from a simple quest for justice to the more chaotic and violent group we see in the game.
It differs mainly in the plot. The original has its set storyline, but the alternate story changes things up. Maybe the main character's motivation is different. For example, instead of seeking revenge like in the original, they could be on a quest for redemption in the alternate story.
It's unique because it allows for new interpretations of the characters. In these fanfics, the MLP characters might have to face challenges like radiation, raiders, and resource scarcity, which is very different from their normal, more peaceful world. And the Fallout New Vegas characters might be influenced by the positive and friendship - based values of MLP. It creates a whole new set of character dynamics that you don't see in the original works.
One great 'Fallout New Vegas MLP Fanfic' is 'The Wasteland and the Ponies'. It combines the post - apocalyptic world of Fallout New Vegas with the colorful and magical world of My Little Pony in a really interesting way. The characters from both universes interact in a way that feels natural, and the story has a great plot about friendship and survival in a harsh environment.
One key feature is how well the two different universes are blended. For example, how the RWBY characters' abilities fit into the Fallout New Vegas setting. If it's a good fanfic, it will make this integration seamless and logical.
Archive of Our Own (AO3) is also a great place. It has some really high - quality fanfictions. The tagging system there is very useful. You can search for specific characters, themes, or plot elements related to 'Fallout New Vegas' to find the fanfiction you want.