What Would Be an Interesting Plot for a Once Upon a Time and Hellboy Crossover Fanfic?

It could work if the plot focuses on a common enemy. For example, a powerful demon that exists in both the Hellboy lore and could potentially invade the Once Upon a Time realm. Hellboy, with his knowledge of the underworld, teams up with the heroes from Once Upon a Time like Emma Swan and her crew. They could combine their powers, with Hellboy's physical prowess and the magical abilities of the Once Upon a Time characters to defeat this shared foe.

One interesting plot could be that a dark force in 'Once Upon a Time' decides to use the power of the vampires and werewolves in Twilight to take over both worlds. The characters from both universes would have to team up to stop it. The heroes like Emma from 'Once Upon a Time' and Edward from Twilight would lead the charge. They would have to learn about each other's powers and weaknesses quickly to be effective.

A possible plot is a crossover with the story of Beauty and the Beast. The characters from Wonderland might enter the Beast's castle. Alice could befriend the Beast and try to break the curse using her Wonderland knowledge. Or, a crossover with the Snow Queen's realm. The cold and ice of that world would contrast with the colorful and chaotic Wonderland. The characters would have to find a way to survive in the frozen land while also dealing with the Snow Queen's power. Also, a crossover with the Little Mermaid's underwater world. The Wonderland characters would have to figure out how to breathe underwater and interact with mermaids and sea creatures.

Well, it might be that the Avengers get transported to the Once Upon a Time universe. Thor could mistake the Evil Queen for Loki in a way, since she's so devious. And then you could have Black Widow using her spy skills to figure out the political intrigue in the fairy - tale kingdoms. The Hulk could be like a giant ogre in that world, and the heroes from Once Upon a Time would be both scared and intrigued by his power.

Some common themes in Once upon a time Hellboy fanfiction include the idea of family. Hellboy's adoptive family and his relationship with them are often explored. Another is the concept of destiny. Is Hellboy fated to be a hero or is there a different path for him? And then there's the theme of the supernatural world. Fanfictions might expand on the different creatures and beings in Hellboy's world, how they interact, and how Hellboy fits into this complex supernatural ecosystem.

One idea could be that Elsa's powers somehow link to a magic in the Once Upon a Time world. Maybe her ice powers are the key to unfreezing a character who has been trapped by a dark curse. For example, she could help break the spell on Emma Swan's parents. Another plot could involve Anna getting lost in the Enchanted Forest and having to team up with characters from Once Upon a Time like Snow White and Prince Charming to find her way back to Arendelle. A third idea is that the Evil Queen from Once Upon a Time tries to steal Elsa's powers to use for her own evil deeds, creating a big conflict between the two universes.

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.

A possible plot could be about a lemon that has magical powers. It might live in a world where fruits have their own society. The lemon could go on an adventure to find a special ingredient to save its ill friend in the orchard.

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.

A great idea for an Once Upon a Time fanfic is to give a happily - ever - after to a character who didn't get one in the show. Take Neal Cassidy, for instance. You could write a story where he somehow comes back to life and reunites with his son Henry in a more complete way. Or you could do a time - travel fanfic where a character goes back in time to change a crucial event. This could lead to a whole new chain of events and relationships in the Once Upon a Time universe.