Obviously, the Avengers members like Iron Man, Captain America, etc. And the Warrior 3 which include Fandral, Hogun and Volstagg.
The main characters would surely be the Avengers, those well - known heroes. And then there are the Warrior 3 from Asgard. Thor might also be a central figure as he has ties to both groups. He could be the one to bring them together in the fanfiction. It's also possible that Loki could make an appearance and cause some trouble for the new - formed alliance.
The Arrow is sure to be a main character. In addition, Hawkeye would be a crucial character in this fanfiction. Since they both are archers, there could be a lot of interaction between them, like competing or collaborating in archery - related tasks. And of course, Captain America with his leadership skills would also be among the main characters to lead the team that now includes the Arrow.
Well, perhaps the Avengers and the Warrior 3 could team up to fight a common enemy. They might combine their unique powers and skills.
In addition to the well - known Avengers, there might be some new or less - known characters. Maybe some characters from Iron Man's rogues' gallery could show up. Or perhaps a new hero that is related to Iron Man's technology in some way. There could also be some side characters that are important for the development of the story, like Pepper Potts who has a close relationship with Iron Man.
Thor would be the most likely. Since Thor has a connection to Norse mythology already, he would be familiar with Sleipnir. He might see Sleipnir as a symbol of his home realm and would quickly bond with it. They could communicate in a way that the other Avengers can't, sharing stories of Asgard and the great battles there.
Obviously, Peter (presumably Peter Parker, Spider - Man) would be one of the main characters. And of course, the Avengers members like Iron Man, Captain America, Thor, Hulk, Black Widow, and Hawkeye are likely to be main characters too as they are the ones 'meeting' Peter.
Obviously, Rhodey and the Avengers members like Iron Man, Captain America, Thor, Hulk, etc. would be the main characters.
Splinter is also likely to be a main character. He is the turtles' master and mentor, and his wisdom often guides them in difficult situations. In this fanfiction, he might play a crucial role in helping the turtles face new challenges.
The marauders are the central figures from the past. James Potter could be a fun - loving grandfather, Sirius Black the cool and rebellious one. Remus Lupin would be the wise and kind grandfather. Their grandchildren could be a diverse bunch. There might be a Potter grandchild who is a bit of a troublemaker like James was. A Black grandchild who is very proud of their family heritage. And perhaps a Lupin descendant who is very studious and wants to learn all about Remus's life. Peter's grandchild might be a character who is trying to find their place in the family after Peter's betrayal.
The main characters could be the political leaders of the nations and the confederacy. They would be the ones making the big decisions in diplomatic meetings and negotiations. For example, a president or a prime minister from a nation, and a council leader from the confederacy.
Obviously, Percy is one of the main characters. And then there would be various gods like Zeus, Poseidon, Athena, etc. These gods play important roles in Percy's world and their interactions with him would be central to the story.