You could write a fanfic about an alternate universe where the Eternals have different powers. Maybe instead of Thena being a fierce warrior, she has the power to manipulate time. This would change the dynamics of their battles and how they interact with each other. Or a fanfic that shows what would happen if the Eternals were to lose their memories and have to rediscover who they are and their purpose. They would have to rely on their instincts and the few clues they could find about their past.
A cool Eternals fanfiction could center around the powers of the Eternals. Imagine a story where Druig uses his mind - control powers in a more complex and morally ambiguous way. Maybe he tries to control a powerful human leader to bring about world peace but faces opposition from the other Eternals. Also, a fanfiction about the Eternals adapting to modern - day Earth after being away for so long would be interesting. They would have to deal with new technologies and cultural changes.
You could write a fanfiction where some of the Eternals get separated from the group and have to survive on their own in a hostile part of the world. They would have to use their powers in new and creative ways to stay alive and find their way back to the others. This would show their individual strengths and weaknesses more clearly.
One idea could be exploring the backstories of the Eternals in more depth. For example, how they first arrived on Earth and their initial reactions to this new planet. Another could be a love story between two Eternals that was previously untold, perhaps a forbidden love due to some ancient Eternal law. A third idea is to create a story where the Eternals have to team up with modern superheroes to face a new, greater threat that neither could handle alone.
One idea could be that the Eternals' powers are needed to defeat a new, extremely powerful villain that the Avengers alone can't handle. For example, a cosmic entity that can manipulate time and space. The Eternals' long - lived knowledge and unique abilities would be crucial in formulating a battle plan.
Well, perhaps in the fanfiction, there could be a cultural exchange of sorts. The Eternals could introduce the Avengers to their long - lived and different ways of life. This might lead to some interesting character development, like Thor learning new forms of combat from an Eternal warrior. Also, the discovery of a hidden connection between the two groups, such as a shared ancestry in some ancient, forgotten time, could be a great plot point.
One idea could be a battle where the Eternals and Avengers are initially at odds due to a misunderstanding. Maybe they both think the other group is causing some strange cosmic events. Eventually, they figure out it's a third party and team up.
One interesting concept could be the merging of different Eternal characters' powers in unexpected ways. For example, if Ikaris and Sersi's powers were combined in a fanfiction scenario, it might create a whole new kind of energy - based ability. Another concept could be crossovers with other fictional universes, like the Eternals meeting characters from the Marvel's Asgardian realm.
One great 'Avengers watch Eternals' fanfiction could be one where the Avengers are in shock at the powers and history of the Eternals. They might be watching some sort of recording about the Eternals' past battles. Another could involve them watching the Eternals interact on their home planet and the Avengers learning about their complex social structures.
One good experience could be finding a fanfic that explores the backstories of the Eternals in more depth. For example, a fanfic might focus on Ajak's relationship with Arishem before the events of the movie. It can add new layers to the characters and make you see them in a different light.
One common theme could be the relationship development between two male characters from the 'Eternals'. It might explore how they overcome challenges in a world full of superhuman powers and ancient secrets.