They can be incorporated by creating crossovers. For instance, a spell from Harry Potter could find its way into the Twilight world and Bella could be the one to encounter it. This would add an element of magic to the Twilight story that wasn't there before.
Maybe there are some secrets about the Volturi that are similar to the dark secrets in the Harry Potter series. In Twilight fanfiction, Bella might find out that the Volturi have a history or power source that is reminiscent of the Death Eaters in Harry Potter. This could lead to a whole new adventure for Bella as she tries to deal with this knowledge and protect her loved ones.
Yes, there are some out there. You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just search for 'Twilight Bella is a werecat' and you'll likely find a variety of stories with different takes on the concept.
Love is a common theme. In these fanfictions, the secrets often revolve around the characters' love for each other. For example, a character may keep a secret to protect their loved one.
I'm not sure exactly as I haven't read it. But perhaps it could be secrets about the characters' pasts, secrets related to the setting of Bella Terra like hidden places or historical events. It might also involve secrets between the characters regarding love, betrayal or power struggles.
In 'Saving Bella' fanfiction, it might involve a unique take on rescuing Bella from various perils. Maybe it's a different vampire or werewolf who steps in to save her from a danger that the original story didn't cover. For example, it could be a new character who has a special power or knowledge that enables them to keep Bella safe from a hidden threat in Forks.
In some fanfictions, Jacob and Bella's pregnancy can take on various plotlines. One possibility is that it creates a huge rift between the werewolf pack and the Cullens. Jacob's loyalty to Bella is tested as he tries to protect her and their unborn child from the potential threats in the Twilight world, like the Volturi. This situation often leads to a lot of drama and tension in the fan - created stories.
One interesting aspect could be how their relationship dynamics change. In the original, Edward was the vampire and Bella was the human, so reversing their roles might lead to a different power dynamic. For example, Bella as a vampire would have more physical strength and speed, which could make her more protective of Edward. Also, Edward as a human might struggle with his mortality compared to Bella's immortality, creating new tensions and storylines in the fanfiction.
One implication could be that she is a huge fan of the Twilight series and wants to explore different storylines within that universe. Fanfiction often offers unique takes on the original story.