In certain 'bella is jacob's mate fanfiction', there could be a new group of supernaturals that emerge. They might oppose Bella and Jacob's union because they have their own plans for the world and see their relationship as an obstacle. These new antagonists could bring in new powers and challenges that Bella and Jacob have to face together.
Sometimes, other werewolves who don't accept Bella as Jacob's mate could be the antagonists. They might think that a human - werewolf relationship goes against their pack's rules or beliefs.
Often, other vampires or supernatural creatures could be the main antagonists. For example, vampires who are jealous of Damon's newfound mate might try to drive a wedge between them. Maybe there are some werewolves who see Bella as a threat to their territory because of her relationship with Damon.
Often, the Volturi can be antagonists. They have strict rules about vampire relationships and activities. If Bella and Jasper's relationship goes against their laws, the Volturi would oppose it. They might see it as a disruption to the vampire order they uphold.
Often, the Volturi can be antagonists. They might not approve of Jasper and Bella's relationship for some reason, like they think it goes against vampire laws or traditions. Another possible antagonist could be a rogue vampire who has a vendetta against the Cullens and sees Jasper and Bella's relationship as a way to get to them.
Perhaps there are demons or dark forces that are trying to disrupt the union between Bella and the God of War. These antagonists could be bent on causing chaos and destruction in their world, seeing their relationship as a symbol of hope that they want to destroy.
The two central characters are Jacob and Bella. Jacob, who has the goal of claiming Bella as his mate, may bring his own set of traits like his strong will and determination. Bella, on the other hand, is an important character as she is the focus of Jacob's claim. She might be portrayed as a character who is trying to understand this new aspect of their relationship and how it fits into her life.
It could be the Titans who escaped from Tartarus and are seeking revenge. They might see Percy and Apollo's relationship as a threat to their plans of overthrowing the Olympians. Another possibility is some jealous gods or goddesses who don't like the idea of Percy and Apollo being mates.
The cultural and pack aspects of Jacob's werewolf side are also key. Fanfictions often delve into the werewolf pack hierarchy and how Bella fits into it. For instance, she may have to learn the werewolf traditions and rules. And the pack's reaction to their relationship, whether they accept Bella or not, can add a lot of drama and depth to the story.
One possible interesting plot could be how Bella and Jacob navigate their relationship in a world full of supernatural elements. Maybe they face challenges from other characters who don't approve of their relationship.
It could be that Elijah's own family members play the role of antagonists at first. Maybe some of them don't approve of Bella, thinking she is not suitable for Elijah. This could create a lot of internal conflict within the family and also between Bella and Elijah as they try to overcome the family's objections.
The appeal also lies in the fact that it can rewrite or continue the story in a way that the fans might have wanted it to go. Maybe some fans were not satisfied with how the original relationship was portrayed, so in the fanfiction, they can create a version where Jacob and Bella's mate bond is explored more fully, with more romantic and exciting elements added.