Well, surely the original Avengers like Iron Man, Captain America, Thor etc. would be main characters. Their characteristics and abilities would likely be adapted to fit the 'steel' theme in some way.
It's probable that the main characters are the Avengers we know and love. However, in this fanfic, their characterizations might be different due to the'steel' aspect. Maybe Iron Man is more focused on developing steel - based weapons for the team. Thor's connection to steel could be explored, perhaps his lightning has an effect on steel in this universe. Hulk could have a new form that is related to steel in some way. And of course, there could be original characters who are central to the story, like a steel - forging dwarf (inspired by Thor's world) who helps the Avengers create new weapons and armors out of steel.
Sometimes, the original Avengers themselves still play important roles in the Next Avengers fanfiction, even if they are more in the background as mentors or guides. Their presence still shapes the story and the development of the younger Next Avengers characters.
Obviously, Peter Parker, also known as Spider - Man, is a main character. Then there are the Avengers like Tony Stark, Captain America, Thor, Black Widow, and Hulk. They often play important roles in the fanfiction, either as Peter's mentors, teammates, or sometimes even as antagonists in certain plotlines where there are misunderstandings or conflicts.
Well, in the goblin avengers fanfiction, the main characters are probably a diverse group of goblins. There might be a brave goblin warrior who is always ready for a fight. There could also be a goblin inventor or a goblin with the power of persuasion. These characters would come together to form the goblin avengers and face various challenges.
Obviously, the Doctor from Doctor Who is one of the main characters. He brings his intelligence, his TARDIS, and his unique skills to the story. And of course, the Avengers, which include Iron Man, Captain America, Thor, Hulk, Black Widow, and Hawkeye. Each of them has their own distinct personalities and powers that interact with the Doctor in different ways.
Well, Naruto would likely be one of the main characters. His determination and strong will would be important in the brotherhood. Sasuke could also be a main character, with his power and complex personality adding depth to the group dynamics.
Superman and Captain America would likely respect each other a great deal. They both have strong moral compasses. Superman might be impressed by Cap's leadership skills. Iron Man, on the other hand, would probably be curious about Superman's powers and how they work. Thor might see Superman as a worthy ally, like another powerful being from a different 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.
Well, of course, the Avengers are the main characters in a sense. You'll have Iron Man, Captain America, Thor, Hulk etc. Then there's the adopted character. This character could be an original creation, like a young girl with psychic powers. They often become a central part of the story, interacting with each Avenger in different ways.
Often, new characters might be introduced in the fanfiction too. But the main focus remains on Bucky and his relationship with the core Avengers. For instance, Wanda Maximoff could also play an important role. She might have some sort of connection with Bucky due to their shared experiences of being manipulated in the past. Their interactions can add depth to the story.