Will's family members are also important. His parents, for example, would be key characters. They are the ones who will form an opinion of Nico. Siblings, if Will has any, could also be important. They might be curious about Nico, or they could be a bit protective of Will and initially be a bit wary of Nico. There could also be other relatives that are part of the family dynamic in the fanfiction.
Well, perhaps there will be some heartwarming scenes. Will's family could be very welcoming. They might ask Nico a lot of questions about his life, his powers as a demigod, and his relationship with Will. Nico, in turn, may start to feel like he belongs in this new family environment. There could also be some comical moments, like when Nico accidentally reveals some strange demigod habits that the family has never heard of.
The theme of self - discovery is also prevalent. Nico might learn new things about herself when she's around the Avengers. Maybe she discovers new aspects of her powers or her personality. And for the Avengers, they might also have a new perspective on their own abilities and roles when they meet Nico. It's like a journey of growth for all the characters involved in these fanfictions.
Perhaps Nico's own insecurities could act as an antagonist. His future self might be so different and successful that Nico starts to feel inadequate and his self - doubt tries to prevent him from fully interacting with his future self and learning from the encounter. Another idea is that there could be a group or organization in the story that has rules against time - traveling encounters like this, and they try to stop Nico from having this meeting.
Well, perhaps his future self shows Nico a different path he could take in life. For example, if Nico is currently on a path that leads to loneliness in the future, his future self might encourage him to be more open and make more friends. This could lead to a whole new set of adventures and character development for Nico. It could also be that his future self has achieved great things, and gives Nico the motivation and guidance to strive for similar goals.
In the fanfiction, Nico might find himself in some of the Marauders' pranks. Since the Marauders are known for their mischief, they could include Nico in one of their elaborate schemes against the Slytherins. Nico, being from a different background, might have a different perspective on these pranks and could either enhance them or try to stop them depending on his moral compass at that moment.
Well, if Nico di Angelo meets Voldemort in a fanfiction, it depends on the writer's take. Nico could see Voldemort as just another evil entity to oppose. He might use his connection to the Underworld to his advantage. For example, he could summon some undead creatures to fight against Voldemort's Death Eaters. Voldemort, on the other hand, would probably view Nico as a strange and unexpected foe. He might try to use the Killing Curse on Nico, but Nico's ability to disappear into shadows could make it difficult for Voldemort to land a hit.
Well, Nico could use his powers to surprise the Avengers. Maybe his shadow - traveling ability would come in handy during a battle, like he could quickly transport himself and some Avengers to strategic locations.
Sure. You can try looking on Archive of Our Own (AO3). There are likely many great 'nico meets the avengers' fanfictions there. Just use the search bar and type in the relevant keywords, and you'll be presented with a variety of options.
It could also be James. James is a natural leader and is always looking to include interesting people in his circle. When he sees Nico, he might sense that there's something special about him. He'd probably start by asking Nico about his abilities and before long, they'd be chatting like old friends. Plus, James has a big heart and would be accepting of Nico quite quickly.