Peter is the central figure in this fanfiction. He's the one who has to deal with the symbiote. But also, his friends like Ned Leeds and MJ might play important roles. They could be the ones who notice the changes in Peter due to the symbiote and try to help him or at least figure out what's going on. Maybe Flash Thompson could also be involved, either as an antagonist or someone who gets caught up in the chaos that the symbiote - influenced Peter might cause.
The main character is Peter Parker. In this fanfiction, he is the one making the choice to keep the symbiote. Alongside him, there could be other characters from the Spider - Man universe. His aunt May might be in it, worried about the changes she sees in Peter. And of course, villains from the Spider - Man world could also be part of the story. They might be either more of a threat because of Peter's new situation with the symbiote or be interested in getting the symbiote for themselves.
The 'Peter keeps the symbiote fanfiction' could potentially delve into Peter's internal struggle. On one hand, he has this powerful symbiote that gives him great strength, speed, and other abilities. But on the other hand, he has to constantly fight against the symbiote's urge to be more violent and less moral. It might also involve him trying to hide the symbiote from his friends and enemies alike, creating a lot of tension and interesting plot twists as he tries to balance his life as Peter Parker and his new, more complex life as Spider - Man with the symbiote.
Often, there can be other existing Marvel characters who play important roles. For example, Spider - Man might make an appearance. Since Venom has a connection to Spider - Man in the original comics, it's not uncommon for him to show up in fanfiction. He could be a mentor, an enemy, or just an observer of the oc hybrid's journey.
One good 'Spider Man keeps symbiote' fanfiction is 'The Symbiotic Bond'. It explores how Spider Man manages to control the symbiote's darker urges while using its powers for good. Another is 'Symbiote Redemption' which delves into the idea of the symbiote becoming more heroic over time in Spider Man's company. And 'Spider - Symbiote Alliance' shows an interesting take on their partnership in a more complex urban setting.
Venom is a very popular character in hybrid symbiote fanfiction. His dark and complex nature makes him a great subject for different storylines. Another popular one could be Carnage, with his chaotic and violent tendencies. They often serve as the basis for exploring the concept of hybrid symbiotes.
There could also be antagonists. For instance, some old enemies of Percy might be drawn to him because of the Curse of Achilles. They might see it as a challenge or an opportunity to finally defeat him, and these antagonists would be important characters in driving the story forward.
Obviously, Harry Potter is one of the main characters. He is the one who is trying to keep Norbert. And Norbert himself is also kind of a main character in a sense, as the whole story revolves around Harry keeping him. Hagrid might also be an important character as he was the one who brought Norbert to Hogwarts in the first place.
Since it's a Harry Potter fanfiction, it could involve the main characters from the original series like Harry, Hermione, and Ron. Maybe they are the ones dealing with the situation of the babies being 'for keeps'.
There could also be new characters created specifically for the fanfiction. Maybe a new love interest for one of the Peters, or a sidekick that is unique to this particular fan - made story. This new character could bring a fresh dynamic to the relationship between the two Peters.
The main characters are definitely the two Peters. However, other supporting characters are likely to include Pepper Potts who could offer some non - combat help to the Peters, like providing resources or shelter. And then there's Spider - Man's friends from his own universe like Ned Leeds or MJ. In the Avengers side, Thor could be involved in some way, perhaps using his Asgardian knowledge to help the Peters understand the multiverse concept better.
It's possible that the fanfic creates a whole new set of characters within the world of the crimson shadows symbiote. These characters could have their own motives and backstories that drive the story forward.