The aftermath might involve a lot of emotional turmoil. Characters could be feeling guilt, especially if they did something extreme during the fight. They might also be experiencing shock at how violent things got. And there could be a search for answers. If the fight was part of a bigger mystery, the characters would start looking into who really instigated it all.
Well, one possible scenario could be characters dealing with their injuries. Maybe they're in a makeshift medical area, trying to patch themselves up while reflecting on what led to the fight. Another could be the start of a new alliance. For example, two characters who were on opposing sides during the fight realize they have a common enemy and start to form an uneasy truce.
Often in the aftermath of a fight in a fanfic, there are consequences for the environment. If the fight took place in a building, there could be destruction everywhere. People would then have to figure out how to clean up and rebuild. Also, relationships are likely to change. Friends might become estranged, or enemies could become more respectful of each other after seeing each other's fighting capabilities.
Perhaps they are in a hotel room while on tour. Jin might start it by tickling J - Hope, and then it spreads to the others. They could be jumping on the beds, trying to escape the tickles while also tickling the others back. It would be a very chaotic and energetic scene full of laughter.
A third storyline could be about the villains who survived or emerged after Infinity War. Maybe some of them see an opportunity to take over in the power vacuum left by Thanos. The fanfic could explore how the heroes have to deal with new threats while still reeling from the events of Infinity War.
Android 18 might have a power - up where she can better regulate her infinite energy. This would make her attacks more consistent and powerful. Vegeta could power up by learning from his past battles with other strong opponents. He might unlock a hidden potential within himself that gives him a boost in speed and strength. Also, he could merge his Saiyan pride with a new fighting style inspired by his allies.
Well, it could involve an explosion in a laboratory, causing chaos and endangerment to the scientists present.
The princess could face challenges from traditional politicians. She might have to prove her leadership skills and overcome gender stereotypes.
A plot might also revolve around the villains. Some villains might see the chaos as an opportunity to take over. The Avengers would then have to deal with new threats while still recovering from the events of Infinity War. The fanfic could show how they come up with new strategies and alliances to face these challenges.
In a 'Harry Potter betrayed fanfic', perhaps Hermione turns against Harry. It could be because she disagrees with Harry's more dangerous and reckless plans to fight Voldemort. She might think he's endangering too many lives without proper thought, and this leads to a rift and a sense of betrayal.
One possible scenario could be Naruto exploring new jutsu by experimenting on his own chakra. Maybe he tries to combine different elemental chakra within himself in unorthodox ways to create a super powerful and unique jutsu. Another could be related to his physical endurance. He might experiment with training methods that push his body to the limit, like enduring extreme pain or fasting for long periods while still trying to perform at his best in combat simulations.
One possible scenario could be that he succumbs to the hardships in the village as a child. Maybe the villagers' hatred towards him is too much to bear, and he gets into a situation where he can't defend himself. Another could be that he's on a mission early on and it goes horribly wrong, perhaps facing an enemy far too powerful for his young self.
It could involve unexpected technological advancements that shape a completely new future. Maybe like time travel or mind-bending inventions.