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.
One idea could be that Nightwing is transported to the Avengers' universe through some sort of interdimensional rift. He then has to team up with the Avengers to fight a common enemy, like Thanos who has somehow acquired some of Batman's tech. Nightwing's acrobatic skills and detective abilities would be a great addition to the Avengers' power set.
Superboy could potentially be Nightwing's closest ally. Superboy has a lot of power but lacks the finesse that Nightwing has. Nightwing could help him control his strength better and in turn, Superboy could offer his brute force to support Nightwing in battles. Their relationship could grow as they face challenges together within the Young Justice team.
Captain America could be a strong ally for Nightwing. Captain America is a great leader and has a strong sense of justice. Nightwing, coming from Gotham, also has a deep - rooted sense of right and wrong. They could lead the Avengers together in a battle, with Captain America providing the strategic leadership and Nightwing using his agility and combat skills to execute the plans on the ground.
One possible plot could be Nightwing joining Young Justice as a mentor. He'd bring his years of experience from being Robin and working with Batman. He could train the young heroes in new combat techniques and also teach them about stealth and detective work.
Well, perhaps in this fanfiction, there's a multiverse rift that pulls Nightwing into the Avengers' world. The Avengers initially mistake him for an enemy, but after some misunderstandings are cleared up, they realize his skills. Together, they face a new threat created by a combination of Hydra and some of Nightwing's rogues gallery who have also crossed over. Nightwing could teach the Avengers some stealth tactics while they show him how to handle more powerful cosmic threats.
In the 'nightwing meets the avengers fanfiction', there are a lot of possibilities. Nightwing could be a bit of an outsider among the Avengers at first. His more stealthy and agile approach might be different from what the Avengers are used to. He might form an interesting bond with Black Widow as they both have a background in stealth. They could go on a mission together where Nightwing's skills in traversing a cityscape are put to good use, while Black Widow uses her espionage skills to gather intel, and together they make a great team against a villain who is hiding in a heavily populated urban area.
Some Avengers might be excited. Captain America, for example, would probably welcome Nightwing for his sense of justice and fighting skills. Thor might be intrigued by this new addition from another world (in a sense, as Gotham is different from Asgard). However, Hulk might not care much as long as Nightwing doesn't get in his way during a fight. Overall, there would be a mix of curiosity and acceptance.
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.
If Sayian joins the Avengers in fanfiction, there could be a huge power boost for the team. Sayian's super strength and fighting abilities would make them a formidable addition. They could easily take on powerful villains that the Avengers might struggle with alone. Maybe they would introduce new combat techniques to the Avengers, like some unique Sayian martial arts moves.