Once upon a time and Harry Potter fanfiction: What are some interesting plot ideas?

One interesting plot idea could be a time - travel story where Harry Potter goes back in time to the founding of Hogwarts. He could interact with the four founders and perhaps change some small events that have a big impact on the future. Another idea is a crossover with the 'Once Upon a Time' concept, where the magical world of Harry Potter is merged with the fairy - tale realm. For example, Harry and his friends could meet characters like Snow White or Cinderella and they all have to work together to defeat a new dark threat that spans both worlds.

One idea could be a crossover with the world of Narnia. Harry and his friends could accidentally stumble into Narnia through a magical portal. They would then have to adapt to the new world, deal with the White Witch, and maybe use their own magic to help the Narnians. Another plot could involve a crossover with the Lord of the Rings. The Hogwarts students could be transported to Middle - earth to help in the fight against Sauron. They could use their unique spells and magical abilities in battles against orcs and other dark forces. A third idea might be a crossover with Alice in Wonderland. Harry could follow a strange magical creature down a rabbit hole and end up in Wonderland, where he has to solve the crazy riddles and deal with the mad characters while also trying to find his way back to Hogwarts.

One idea could be exploring the backstories of the lost boys in more detail. Maybe one of them has a hidden connection to a character from the outside world. Another plot could involve a new villain coming to Neverland who has a different kind of magic that challenges Peter Pan. Also, a story about Wendy's granddaughter returning to Neverland to find a lost family heirloom could be interesting.

Another interesting plot could be Loki falling in love with a character from Once Upon a Time. Maybe he has a relationship with a princess or a powerful sorceress, and their love story is filled with magic, drama, and challenges as they come from different worlds.

One idea could be a new agent arriving at Warehouse 13 with a mysterious past that turns out to be linked to an artifact that was thought to be lost forever. This new agent might unknowingly hold the key to controlling the artifact's power, causing a stir among the existing agents as they try to figure out how to handle the situation.

A love - interest plot for Gideon would also be interesting. He could fall in love with a character from a different realm within the Once Upon a Time universe. Their relationship would be complicated by the different rules and cultures of their respective realms. They would have to overcome many obstacles, like disapproving family members or the threat of war between their two realms.

One idea could be exploring Gothel's backstory before she became the villain we know. Maybe she had a tragic love in her youth that turned her bitter. Another plot could involve Gothel teaming up with an unexpected character from the Once Upon a Time universe, like a hero who thinks they can reform her. A third option is to create a story where Gothel has a daughter of her own and we see how she raises her in contrast to how she treated Rapunzel.

One idea could be to create a story where a new character, an aspiring actress, befriends Rick Dalton and Cliff Booth. She gets involved in their crazy Hollywood adventures and helps Rick revive his career in an unexpected way, like by introducing him to a new type of movie role that suits his acting style better.

A possible plot could be that Drizella is cursed, and Henry, being the son of Snow White and Prince Charming, has a unique connection to the magic that can break the curse. They embark on a quest to find the ingredients for a potion to break the curse. Along the way, they meet old characters from the Once Upon a Time universe who either help or hinder them. They also have to deal with their own personal issues. Drizella has to confront her past and her insecurities, while Henry has to prove himself as a hero without relying too much on his family's legacy.

A really interesting plot could be that an ancient curse has been placed on both Emma's Storybrooke and Elsa's Arendelle. The curse is slowly draining the magic from both places. Emma and Elsa team up, using their combined magic knowledge and their strong wills. They travel to different magical realms to find the source of the curse and break it. They encounter many magical creatures and face various challenges that test their friendship and their magic skills.