In shadow the vampire hedgehog fanfiction, Shadow is the main focus. But other characters like Tails can be important too. Tails might be using his intelligence to try and find a cure for Shadow's vampirism. Silver could also be a character. He could come from the future to prevent some disaster that Shadow's vampire form is causing or is about to cause. These are some of the main characters that are likely to be in such fanfictions.
Obviously, Shadow the Hedgehog is a main character. He's the one with the vampire - like qualities. Sonic could also be a main character in some fanfictions. He might be in conflict with Shadow because of his new vampire nature or could be trying to help him control it. Amy could be another main character, perhaps she has a special connection to Shadow and tries to understand his transformation.
Maybe the main antagonist is a scientist who has been experimenting with vampire-like powers and accidentally creates a powerful vampire - like monster. This monster then starts attacking the world, and Shadow, as a new vampire - hedgehog, has to stop it. The scientist might also be trying to cover up his mistake and will stop at nothing to keep Shadow from interfering.
Obviously, Shadow himself would be a main character even in his baby form. Sonic would also be a key character as he is often the hero in these Sonic - related stories. He would likely be involved in trying to figure out how to turn Shadow back. Tails could be another main character as his intelligence would be useful in finding a solution to Shadow's transformation. He might study the cause of it and try to come up with a remedy.
The main character is, of course, Shadow the Hedgehog himself. He is the central figure in this dark story. And then there's Dr. Eggman. He often plays a role in Shadow's story, either as an antagonist trying to use Shadow for his evil schemes or as someone who is involved in the events that led to Shadow's creation. There are also other characters like Sonic and his friends who sometimes cross paths with Shadow in this story, and their interactions add more depth to Shadow's dark journey.
One interesting plot could be Shadow the Hedgehog's struggle to control his new vampire - like powers. For example, he might have to deal with an insatiable thirst for blood while still trying to protect his friends and the world. Another plot could involve Shadow being hunted by a group of vampire hunters who mistake him for a true evil vampire, leading to a lot of action - packed chase scenes.
Shadow the Hedgehog is obviously one of the main characters. There might also be Sonic, as he often has a connection to Shadow's story.
In the 'Shadow the Hedgehog Pure Dark Story', the main character is Shadow himself. But other characters like Rouge the Bat could also play important roles. Rouge has had a relationship with Shadow in the Sonic universe. She might be torn between helping him out of his dark state or being caught up in the chaos he creates. And then there could be some minor characters who are either victims of Shadow's new - found dark nature or those who try to oppose him in his dark journey.
Sonic is a very popular character to pair with Shadow. Their rivalry and yet potential for teamwork makes for great fanfiction. Tails is also often paired with Shadow. Tails' intelligence can complement Shadow's combat skills. And Knuckles is another one. His strength and connection to the Chaos Emeralds can create interesting storylines when paired with Shadow.
One idea could be that Shadow discovers he has vampire-like abilities after a strange encounter in a dark, enchanted forest. He then has to struggle with his new thirst for blood while still trying to protect his friends and the world from villains.
Well, aside from Shadow, Omega is a really cool character to include. His robotic nature and his loyalty to Shadow can create some interesting storylines. Tails could also be included, especially if you want to explore the scientific side of the Sonic universe in your fanfiction. He can interact with Shadow in various ways, like helping him with some sort of technological problem or even getting into an argument about the ethics of certain actions. Another popular character is Knuckles. His guardian role of the Master Emerald can bring in elements of mystery and adventure when combined with Shadow's story.
Dr. Eggman could still be a major villain. He might see Sonic's new vampire state as an opportunity to study and use it for his own evil plans. Maybe he tries to create an army of vampire robots. Another potential villain could be an ancient vampire lord who sees Sonic as a threat to his rule over the vampire world.