Doctor Strange is very likely to be a main character. His expertise in the mystic arts makes him a key figure in understanding and dealing with the multiverse. Also, characters like Spider - Man from different universes could be involved. They could bring their unique skills and personalities to the story, and their different versions might have different relationships with the other Avengers.
Loki could also be a main character. Given his history of causing chaos and his knowledge of different realms, he could play a crucial role in either helping or hindering the efforts to deal with the multiverse collision. And Scarlet Witch might be there as well, considering her powers are closely related to reality - warping which could be a big factor in a multiverse - related story.
Definitely the core Avengers like Iron Man, Captain America, Thor etc. Since it's about the multiverse colliding, we'll probably see their alternate versions too. For instance, a more steampunk - inspired Iron Man from a different universe or a female Captain America.
Perhaps a plotline where the Avengers from different universes have different moral compasses. Some might be more ruthless in their methods of dealing with the multiverse collision. This could lead to internal conflicts within the newly - formed multiverse Avengers team. They would have to figure out how to work together despite their differences while also trying to save all the universes involved.
Most likely, the main characters would be the Avengers we all know, like Iron Man, Captain America, Thor, etc. But since it's about two worlds colliding, there could also be new versions of these characters from the other world.
There could also be secondary characters that play important roles. For instance, characters like Vision or Scarlet Witch. Vision's unique powers and his relationship with the other Avengers could add an interesting dynamic. Scarlet Witch's powers are extremely powerful and often unpredictable, so she could be a key figure in any sort of conflict or plot development within the fanfiction. Additionally, new characters created specifically for the fanfiction might also become important, depending on the creativity of the writer.
Definitely the Avengers members like Captain America, Iron Man, Thor, Hulk etc. would be main characters as they are the core of the Avengers. On the Hydra side, characters like Baron Wolfgang von Strucker could be prominent. Also, there might be some original characters created specifically for the fanfiction, perhaps a Hydra scientist who is behind a new and dangerous experiment targeting the Avengers.
Percy Jackson himself is very likely to be one of the main characters. His life is at the center of much of the action in the original series, so in a fanfiction about lives colliding, he would be a key figure. Annabeth Chase would also be likely involved, as she is Percy's close companion and often involved in his adventures.
In 'rwby reading the multiverse fanfic', the main characters would surely include Ruby, Weiss, Blake, and Yang. But it could also feature other important characters from RWBY like Ozpin or Qrow. Since they are all part of the RWBY universe, they might get dragged into the multiverse adventures as well. Maybe they would play important roles in guiding the main girls or helping them understand the new universes they find themselves in.
Obviously, Ruby, Weiss, Blake, and Yang are likely to be the main characters. Since it's RWBY - related, they would be the central focus as they watch the events in the multiverse. They are the ones whose reactions and interactions with the multiverse would drive the story forward.
A new character, like a powerful interdimensional sorcerer who wants to merge all the universes into one chaotic realm under his control. He has the ability to manipulate the fabric of the multiverse and can summon different versions of villains from various universes to do his bidding. The Avengers would have to not only fight his minions but also figure out a way to stop him from achieving his goal of multiversal domination.
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.