Another possibility could be a new character created specifically for the fanfiction. This new character might have unique abilities or a personality that attracts Edward in ways Bella didn't. For example, she could be a vampire from a different coven with a very different view on life and love, which makes Edward question his feelings for Bella and consider this new character as a potential mate.
It could also be a character from another story or universe that is somehow inserted into the Twilight fanfiction world. Maybe a powerful fairy or a werewolf princess (even though in the original Twilight werewolves and vampires don't get along well in that way). Writers often like to cross - over different fictional universes to create new and exciting storylines.
She should be strong - willed. Edward is a very complex and often stubborn character. His mate would need to be able to stand up to him and not be easily swayed. For example, Bella was strong - willed in her own way, she didn't let Edward completely control her life.
It could be a werewolf. In the Twilight universe, werewolves and vampires often have a complex relationship with humans. A werewolf might have been Bella's real mate, perhaps one that she met briefly before Edward entered the picture. Maybe this werewolf had a special connection with Bella that was disrupted when Edward came along.
It's hard to define the 'best' as it depends on personal taste. However, some well - known authors in the fanfiction community might include those who have a large following and positive reviews. For example, some authors who are really good at capturing the essence of Edward and Bella's relationship and writing engaging stories.
One possible plot could be that Harry and Edward initially clash due to their different personalities and backgrounds. Harry might be a more impulsive creature, while Edward is more reserved. But as they are mates, they gradually discover they have common goals, like protecting their community from a hidden threat. And through their adventures together, they learn to understand and love each other more deeply.
Edward could be an ordinary man living in a small town. He has always wanted a family of his own but couldn't find the right partner. So, he decides to adopt a child to start his own family unit.
It could be Hermione. In some alternate interpretations, there could be a situation where Hermione, while trying out a new and powerful magic, accidentally hurts Harry. Their friendship is put to the test as Harry has to deal with the pain and Hermione has to come to terms with what she's done.
Obviously, the Twilight King is one of the main characters. He is likely to be a powerful and mysterious figure with his own set of powers and a kingdom to rule. His mate is another main character, though we don't know much about this character yet. There might also be some side characters like advisors to the king, or perhaps other magical beings in the kingdom who play important roles in the story.
Obviously, Elijah is one of the main characters. His mate would also be a main character, though we don't know who she is yet without reading the fanfiction. There could also be some characters from the original Twilight series like the Cullens or the werewolves that might play important roles in the story.
One possible reason could be that Edward has some internal moral code. He might believe that acting on Bella's seduction goes against his principles, perhaps related to his view on relationships or self - control.
The overall tone can become more bittersweet. Without the 'mate' connection, there's a sense of loss or unfulfilled expectation. For Bella, it could mean a journey of self - discovery that is tinged with sadness as she moves away from what was expected in the original story.