Well, perhaps they meet in a crowded city street. Shion is running late for an important meeting and accidentally bumps into Kiyoki, causing them to drop their things. As they pick up their belongings, they start chatting and realize they have a shared interest in art. This could lead to them visiting art galleries together and becoming good friends over their love for different artworks.
They could meet in a library. Shion is looking for a very rare book and Kiyoki happens to be the librarian's assistant. Kiyoki helps Shion find the book and in the process, they find out that they both have a passion for old, forgotten stories. They then start to exchange their favorite tales and form a bond based on their mutual love for literature.
In this fanfiction, Shion and Kiyoki are likely two characters created by the fanfic author. They could be based on certain archetypes like Shion might be the more adventurous type, always looking for new experiences. Kiyoki, on the other hand, could be more reserved and calm. But when they meet, their personalities start to complement each other.
One idea could be that Naruto and Shion travel back to the founding of Konoha. They could use their modern knowledge and skills to help the early founders avoid some of the future problems. For example, they might be able to prevent certain clan rivalries from getting out of hand.
One idea could be that Arrow is transported to Gotham and teams up with Batman to take on a common enemy like Ra's al Ghul. They could combine their skills, with Arrow's archery and Batman's detective and combat skills.
A plot could involve Peter's identity being at risk and Daredevil helping him keep it a secret. Since Daredevil is so good at operating in the shadows, he could teach Peter some new ways to move around the city without being detected. They could also have a conflict about their different approaches to justice. Peter is more about saving everyone, while Daredevil has a more 'punish the guilty' attitude at times.
A plot could involve Spiderman getting framed for a crime in Daredevil's territory. Daredevil initially suspects Spiderman but as he investigates, he realizes that there's a bigger conspiracy at play. They then join forces to clear Spiderman's name and expose the real culprits. This would involve a lot of detective work from Daredevil and Spiderman using his agility to gather evidence.
In some fanfictions, they could meet during a time - travel incident. Naruto from the present meets Naruko from the past or vice versa. They then exchange knowledge about the future or past events, which changes the course of their own timelines. This could lead to some really interesting character development as they both try to adapt to the new information and how it affects their relationships with their friends and family.
One idea could be that the two Spyros, from different dimensions perhaps, have to team up to defeat a new powerful villain that neither could face alone. For example, a dark sorcerer who is draining the magic from all the dragon realms. Another could be that they initially mistake each other for an enemy and engage in a friendly sparring match before realizing they are on the same side. Then they combine their unique skills, like one Spyro's amazing flying maneuvers and the other's powerful fire breath, to solve a mystery in the dragon world, like the disappearance of an ancient dragon artifact.
A really cool plot could be that there's a prophecy that involves both Percy and Magnus. They initially don't trust each other but as they start to work together to fulfill the prophecy, they realize that they have more in common than they thought. Along the way, they might meet other characters from both of their stories, and there could be some epic battles and heart - warming friendships formed. There could also be a love interest involved, perhaps a character from one world falls for a character from the other world, adding a bit of romance to the mix.
One idea could be that Sonic and Mario have to team up to save both their worlds from a new, powerful villain who has the ability to manipulate time. This would force them to use their unique speed and jumping abilities in new and creative ways.
Another plot could be that a group of humans accidentally stumble into the world of Littlefoot. Littlefoot is curious about them and decides to approach them. The humans are also intrigued. Some of the humans want to study Littlefoot and his friends, while others want to protect them from potential harm. This creates a complex situation where Littlefoot has to figure out who to trust among the humans.