When Loki joins the Avengers in fanfiction, there are so many storylines possible. There could be a storyline centered around Loki's relationship with Thor within the context of the Avengers. They could have brotherly reconciliations and also arguments that affect the whole team. Another potential storyline is Loki bringing in his own set of enemies. Since he has a history of making foes, these enemies could target the Avengers because of Loki's association with them. This would force the Avengers to deal with new and unexpected threats. And there could be a storyline where Loki tries to reform the Avengers' image in the eyes of the public, as he has his own way of looking at things and might think the Avengers could use a makeover in terms of how they're perceived.
There are numerous storylines that could come out of Loki joining the Avengers in fanfiction. For instance, Loki could have a redemption arc where he gradually becomes a true hero in the eyes of the Avengers. Or there could be a storyline where Loki's past catches up with him and the Avengers have to decide whether to stand by him or not. Also, a fun storyline could be Loki teaching some of the Avengers his magic tricks, which could lead to some comical and also useful situations in battles. He could also introduce the Avengers to some Asgardian customs and technology that they've never seen before, opening up new possibilities for the team.
A new storyline could be centered around Naruto introducing the concept of chakra to the Spriggan 12 world. This could lead to new forms of magic or power being developed. Also, there could be a plot where Naruto's friends from his own world come looking for him and end up clashing with the Spriggan 12. Or perhaps Naruto discovers a connection between the two worlds that no one else knew about and has to deal with the consequences of that knowledge.
One possible storyline could be Supergirl helping the team face a new and powerful alien threat that is specifically targeting Kryptonians. This would put her in the spotlight and show how she uses her powers to protect Earth and the team.
A lot of fanfiction focuses on Loki's redemption arc within the context of the Avengers. For example, Loki could be injured and the Avengers take him in instead of imprisoning him. This leads to him slowly seeing the value in their cause and starting to change his ways. He might start using his powers for good, like helping Thor understand some new magical threats, which also helps to strengthen the bond between him and the Avengers.
One possible storyline could be that Venom is lured to Earth by a powerful villain who wants to use Venom to take on the Avengers. But Venom realizes he's being used and teams up with the Avengers to take down the real villain.
The moon and sun's love could lead to a tale of sacrifice and perseverance. Maybe the moon has to dim its light to be with the sun, or the sun has to tone down its heat. It could also involve them fighting against evil forces that try to separate them.
Well, there could be lots of interesting plots. Maybe Naruto has to balance his relationship and parenting, facing challenges from both.
A great storyline could be Hermione bringing some order to the hunting world with her knowledge from the magical world. She could start by organizing the hunters' research in a more efficient way, like creating a magical library for them. Or she could be the key to solving an ancient curse that has been plaguing both the magical and the supernatural hunting worlds. Another interesting plot could be Hermione having to choose between her loyalty to the magical world and her new family in the Winchester - related hunting world when a conflict arises between the two. This internal struggle could drive the story forward and show how she matures and makes difficult decisions.
There could be a storyline where Spider - Man uses his scientific knowledge to upgrade the Avengers' technology. Or perhaps a story where he has to choose between his loyalty to the Avengers and protecting his own neighborhood. This internal conflict could add depth to the fanfiction. Also, he might team up with Black Widow for a stealth mission where his agility and her skills combine for a successful operation.
In this fanfiction, Daisy might have some initial struggles to fit in with the Avengers. She could be from a different background or have a different approach to fighting. But as time goes on, she starts to bond with the team members, like sharing combat strategies with Black Widow or having a friendly rivalry with Thor in terms of strength. And she eventually becomes an integral part of the team.
In fanfiction, if Nightwing joins the Avengers, there could be some really cool team - up scenarios. He'd bring his acrobatic skills and detective abilities to the group. Maybe he'd form a great partnership with Black Widow in espionage - related missions, as they both have a knack for stealth and getting information. Also, his combat style, which is a mix of martial arts and acrobatics, would add a new dimension to the Avengers' fight scenes.