Another plot could be that Sam's sister falls in love with a character from a different faction in the Twilight universe. This would create a lot of tension as their relationship would be frowned upon by both of their respective groups. It could explore themes of forbidden love and loyalty, as she has to decide between her family and her newfound love.
One idea could be that Hermione uses her intelligence to help Sam out of various tricky situations at school. For example, when Sam gets into trouble with a difficult teacher, Hermione devises a clever plan to get him out of it. Another plot could involve Hermione introducing Sam to the wizarding world, and Sam having to adjust to all the strange new things like magic spells and magical creatures. It could also be interesting if they team up to solve a mystery in their town that has both muggle and wizarding elements.
Well, one interesting plot might be that Bella accidentally stumbles upon an old diary of Sam's that reveals his past insecurities and dreams. She decides to help him fulfill some of those long - forgotten dreams. Another could be that they both get transported to a magical realm and have to rely on each other to find their way back home. This would involve them using their unique skills and the bond they have as siblings. And a third idea is that Bella is bullied at school and Sam stands up for her in a really heroic way, which changes the way the other kids view them both.
One idea could be that Jacob's imprint on Sam's daughter causes a rift in the pack. Some members might not be okay with it due to the loyalty issues between Sam and Jacob. Another plot could be the girl struggling with her own identity while being the center of this supernatural connection. She could be trying to live a normal life but constantly being pulled into the werewolf world.
One idea could be that the twin sister has a different magical ability. For example, while Twilight Sparkle is good at spells related to knowledge and friendship, her sister could be excellent at magic related to nature. This would create a contrast and also opportunities for them to learn from each other. Another plot could be that the twin sister gets into trouble in a different pony world and Twilight has to go rescue her, leading to all kinds of adventures in unknown places.
One plot idea could be that Bella's sister discovers she has a special power as a vampire, like being able to see the future. This could lead to her trying to prevent bad things from happening to her family and the Cullen family. Another idea is that she struggles with the morality of being a vampire while also being in love with a human. She might try to find a way to exist without harming humans, which would create a lot of internal conflict.
One idea could be that Bella discovers she has special powers because of her relation to Sam and Dean. Maybe she can communicate with spirits in a unique way that helps them on their hunts.
One plot idea could be that Bella's sister discovers Caius's true nature as a vampire but instead of being afraid, she is intrigued. She starts to secretly study vampires and their lore, and in the process, catches Caius's attention. He then decides to keep an eye on her, leading to a series of tense yet fascinating encounters.
Well, perhaps Bella's sister is a half - vampire herself. She was born from a vampire who didn't fully turn her mother. This sister could struggle with her identity, not fully fitting in with either humans or vampires. She might be drawn to the Cullens because of their 'vegetarian' lifestyle but also be scared of them. She could also be friends with Jacob before Bella even arrives in Forks, and Jacob has to keep her secret from Bella until the right time.
One idea could be that Sam and Bella discover a hidden magical realm together while on a hike in the forest. They have to work together to find their way out and in the process, they learn more about each other's fears and hopes.
One interesting plot idea could be exploring how different characters adapt to the post - apocalyptic world in new and unexpected ways. For example, a character who was once a timid office worker becomes a fearless scavenger.