A really interesting pairing could be Emma Swan from Once Upon a Time and Spencer Reid from Criminal Minds. Emma is a strong - willed and independent woman who has had to fight for herself and those she loves. Reid is highly intelligent but also has a bit of an innocent side. They could balance each other out well. Emma could teach Reid about having more confidence in his physical abilities, while Reid could introduce Emma to more intellectual concepts. They could work together to solve a mystery that combines the magic of Emma's world and the criminal profiling of Reid's world.
To write an engaging Once Upon a Time and Criminal Minds fanfiction crossover, first understand the core elements of both shows. For Once Upon a Time, it's the fairy - tale characters and their magical realms. For Criminal Minds, it's the profiling of criminals. You could start by creating a scenario where the Criminal Minds team is transported to the world of Once Upon a Time. Maybe they are called in to profile a string of strange murders that seem to be related to a dark magic spell. The team would have to adapt to this new world filled with magic and mythical creatures while using their profiling skills. This creates an interesting dynamic as they interact with characters like Snow White or the Evil Queen, who may or may not be suspects in their case.
A really interesting pairing could be Edward from Twilight and Evy from 'The Mummy'. Edward has his vampire abilities and is very protective, while Evy is smart and brave. They could work together to solve some mystery related to both their worlds. Maybe Edward could use his super speed to help Evy escape from some mummy - related danger, and Evy could use her knowledge of ancient history to help Edward understand more about the mummy's origin.
I think Supergirl and Emma Swan would have an amazing dynamic. Emma is a strong - willed and independent character in Once Upon a Time. She has her own set of powers and abilities. When she meets Supergirl, they could bond over their shared experiences of being different and having to fight for what they believe in. They might also learn from each other's fighting styles and problem - solving techniques. Also, Supergirl and Hook could have an interesting interaction. Hook is a charming but also a bit of a rogue character. His swashbuckling ways would contrast with Supergirl's more straightforward heroism, and they could get into some fun adventures together.
I think Emma Swan and Iron Man would have really interesting interactions. Emma is a strong - willed and independent character, and Tony Stark is full of himself but also brilliant. They'd probably start off butting heads, with Emma not trusting Tony's flashy ways. But then they'd realize they both have a lot to offer in terms of fighting against evil. Tony could offer his high - tech gadgets to help Emma in her battles, and Emma could teach Tony a thing or two about believing in the impossible.
Shepard and Master Chief could be an interesting pairing. Shepard is a very diplomatic and charismatic leader in the Mass Effect universe, while Master Chief is a stoic and highly skilled soldier in the UNSC. Their different leadership styles could either clash or complement each other. They could learn from each other's combat and decision - making skills.
Rumpelstiltskin could be the subject of a haircut fanfiction. Maybe he has a haircut that is part of a deal. A young girl offers to cut his wild, unruly hair in exchange for a favor. As she cuts his hair, she discovers that there are secrets hidden within his hair. Each strand seems to hold a memory or a piece of magic, and by cutting his hair, she unknowingly releases some of his power into the world, creating chaos.
Hermione would first be very curious. She'd start by observing the different types of magic and how they work in the Once Upon a Time universe. She'd likely try to find similarities to the magic she already knows. For example, she might notice how some curses are similar to dark magic she's studied at Hogwarts.
Twilight Sparkle and Hermione would make an interesting pairing. Both are highly intelligent and love to study magic. They could have long discussions about different spells, magical theories, and how magic works in their respective worlds. Another good pairing could be Rainbow Dash and Harry Potter. Rainbow Dash is brave and fast, just like Harry, and they could team up to face some sort of danger, like a dark wizard who has found a way to enter Equestria.
I think Detective Stabler and Brock would make an interesting pairing. Stabler is tough and has a no - nonsense attitude. Brock is knowledgeable about Pokemon and very nurturing. He could teach Stabler about the Pokemon world while Stabler could protect Brock during their investigation into a crime that involves both the SVU world and the Pokemon world, like a smuggling ring that is trading illegal Pokemon and drugs.
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.