What are some interesting plot ideas for 'Harry Potter and Bella Swan fanfiction'?

A plot could revolve around Simon being a long - lost relative of Bella's. He shows up in Forks and his presence disrupts Bella's relationship with Edward. Simon has his own secrets about the supernatural world which Bella gradually uncovers, and she has to decide between the two different worlds she's now a part of.

A plot could revolve around Carlisle and Bella going on a secret mission together. Maybe they have to find a lost ancient vampire artifact that could change the future of the vampire world. Along the way, they develop a deep bond and respect for each other.

One idea could be that Bella, with her experience in the supernatural world from the Twilight series, somehow crosses paths with Chris Halliwell from Charmed. They could team up to fight a new kind of evil that combines the dark magic from the Charmed universe and the vampire - werewolf related threats from Bella's world. For example, a coven of vampires who have learned some dark spells.

A possible plot is that Bella, as a witch and doppelganger, is fated to be a key in a battle between good and evil witches. Her doppelganger form holds a special power that can tip the balance. She has to navigate through her new identity, make friends and enemies among the witch community, and decide which side she truly belongs to.

Another plot could be that Bella Swan has a strange dream about Loki and then discovers she's pregnant. She's confused as she doesn't know how it's possible. Loki, in the meantime, senses a connection to her from afar. He travels to her world to find out more. As they meet, they realize that there's a greater force at work that has brought them together and they must figure out how to deal with the pregnancy and the implications it has for both their worlds.

There could be a story where Charlie Swan adopts a magical creature that has escaped from the wizarding world. He doesn't know it's magical at first but then realizes it when strange things start to happen around his house. He then has to figure out how to return the creature to its proper place in the wizarding world without getting into trouble with the Ministry of Magic.

Perhaps there's a spell gone wrong that links the Twilight world and the Harry Potter world. Charlie Swan and Harry Potter find themselves in a situation where they have to reverse the spell. They encounter various characters from both universes. Charlie has to learn about the wizarding world quickly, and Harry has to deal with the strange vampire and werewolf dynamics in Forks. They face challenges like dealing with the Volturi who see the magical intrusion as a threat, and at the same time, they have to find a way to send everyone back to their respective worlds.

Often, the cultural clash between the Twilight universe's vampire - human relationships and the wizarding world's social norms makes for great plot points. Bella might struggle to fit in with the strict rules at Hogwarts regarding relationships, especially if she has feelings for a wizard who has to abide by different magical laws about love and marriage.

One plot idea could be that Bella leaves Edward to pursue her own dreams. She realizes that she has lost herself in the relationship and wants to focus on her education or a career. For example, she might go to college far away and meet new friends who help her discover new interests. Another idea is that she leaves because she discovers a dark secret about Edward or the vampire world that she can't accept. Maybe she finds out that vampires have a hidden agenda that endangers humans in a way she didn't expect. A third plot could be that she leaves due to a misunderstanding. Edward does something that she misinterprets as a lack of trust, and in her anger and hurt, she decides to leave to protect her heart.

A possible plot could be Bella and Alice going on a road trip together. During the trip, they encounter various challenges and also bond over shared experiences. They might come across other supernaturals and have to deal with them. Or perhaps Alice has a vision about Bella's life as a human being in danger in a specific location, and they go there to prevent it. Along the way, they learn more about each other's pasts and fears.