Well, for a 'the last of us crossover fanfiction', a crossover with 'Stranger Things' would be cool. The kids from Stranger Things with their supernatural abilities could team up with Joel and Ellie. The Upside - Down could be linked to the source of the infection in The Last of Us. They'd all have to figure out how to close the Upside - Down portals and stop the spread of the infection at the same time.
A 'the last of us crossover fanfiction' idea could involve a crossover with 'Game of Thrones'. Picture the post - apocalyptic world of The Last of Us meeting the medieval - like, yet equally dangerous world of Westeros. Maybe Ellie could be mistaken for a powerful sorceress because of her immunity. And Joel could be seen as a skilled warrior. They'd have to deal with the political intrigue and the various threats in Westeros while also trying to find a way back to their own world.
One idea could be a crossover with 'The Walking Dead'. Imagine Joel and Ellie stumbling upon Rick's group. They could exchange survival strategies and maybe even help each other fight off a common threat like a super - infected zombie. Another could be a crossover with 'Resident Evil'. The Last of Us' Clickers and Resident Evil's zombies would create a really intense and terrifying world for the characters to navigate.
One idea could be exploring the backstory of a minor character in the game. For example, you could write about how a random survivor in one of the factions got to be where they are. What events led them to join the group? What were their hopes and fears before the apocalypse? Another idea is to create an alternate ending. Maybe Ellie decides not to go on her revenge journey and instead focuses on building a new community. This could change the whole dynamic of the story.
One interesting idea could be exploring the backstory of a minor character. For example, you could write about how a random survivor in one of the quarantine zones came to be there. Another idea is to create an alternate ending. Maybe Joel and Ellie find a different way to deal with the Fireflies that doesn't involve so much moral ambiguity. A third idea might be to set the fanfic in a different location. Instead of the usual post - apocalyptic cities, it could be in a more rural area and how the infected and survivors interact there.
One idea could be a crossover with the Harry Potter universe. The Avatar characters could attend Hogwarts and learn magic while also using their bending abilities. For example, Aang could use his airbending to enhance his flying on a broomstick. Another idea is a crossover with the Star Wars galaxy. The benders could be like Jedis, using the Force which is somewhat similar to bending the elements. They could help the Rebels in their fight against the Empire.
One idea could be a crossover with 'Harry Potter'. The Avatar could visit Hogwarts and learn about magic there. Maybe Aang could teach the students about bending while learning about spells himself. Another idea is a crossover with 'Lord of the Rings'. The airbenders could fly over Middle - earth and help in the fight against Sauron. They could use their bending skills to create distractions or help in battles.
Well, you could create a fan fiction where new types of infected are introduced. Maybe some that have unique abilities or behaviors that the main characters have to figure out how to deal with. Or perhaps a story centered around the relationship between two characters that didn't have much interaction in the original game, like Marlene and David. You could show how their different views on Ellie and the future of humanity might have led to more intense confrontations.
A possible plot is that they discover a hidden community that seems too good to be true. They have to decide whether to trust it or not. Joel is skeptical while Tess is more open - this could lead to some internal conflict between them. Also, a story about them finding a lost child and having to decide what to do with it would be interesting. Tess might want to help the child while Joel is more worried about the risks it brings.
A good plot for Injustice Gods Among Us crossover fanfiction could be a time - travel - based crossover. Maybe a character from Injustice accidentally travels to a different timeline in the DC universe where things are much more peaceful. This character would then have to adapt to this new world and its heroes and villains. Or perhaps characters from different eras of DC, like Golden Age heroes, cross over into the Injustice universe. They would be shocked by the state of the world and try to bring back the old values of justice. They could team up with some of the Injustice characters who still hold onto those ideals.
One interesting concept could be alternate endings. For example, what if Joel made a different choice at the end of the game? Fanfiction might explore a scenario where he lets the doctors operate on Ellie, and how that would change the fate of both characters and the world they live in.
When writing a 'Last of Us Crossover Fanfiction', focus on the similarities and differences between the two worlds. If you're crossing with 'Star Wars', for instance, you could play on the idea of a post - apocalyptic world like in 'The Last of Us' but in a galaxy far, far away. You can have the Jedi or Sith deal with the Cordyceps - infected. Build the story around how the different technologies and powers would interact. Also, don't be afraid to put your own spin on the characters' relationships. Let them grow and change in unexpected ways because of the crossover.
One idea could be to rewrite the story from a different character's perspective. For example, if there is a side character in 'the story of us', you can show their thoughts and feelings throughout the events. Another idea is to create an alternate ending. Maybe in the original, the couple gets together, but in the fanfiction, they part ways for some unforeseen reason. You could also add new characters to the story that bring in new conflicts or relationships.