Well, perhaps Jack Frost accidentally enters Neverland while chasing a particularly strong winter wind. Peter Pan mistakes him for a new kind of fairy at first. Then they start to compete in various things, like who can fly faster (Jack using his ice - made wings and Peter with his pixie dust). But as they get to know each other, they realize they have a common enemy in Captain Hook, who wants to use Jack's ice powers to freeze the mermaids' lagoon and catch them easily. So they have to work together to stop Hook.
In this fanfiction, it could start with Jack Frost being curious about a strange warm spot in his frozen realm. He follows it and finds himself in Neverland. Peter Pan is intrigued by Jack's icy appearance. They decide to have a friendly wager. If Jack can make the most amazing ice sculpture in a day, Peter will show him the secret hiding places of Neverland. But things go wrong when Tinker Bell gets jealous of their new friendship and tries to sabotage their deal. Jack and Peter then have to fix things not only between themselves but also with Tinker Bell.
There might be a fanfiction where Jack Frost visits Neverland and is initially at odds with Peter Pan. But as they get to know each other, they learn from each other's carefree spirits and form an unexpected friendship. They then go on adventures together across different magical realms, showing their combined abilities to the inhabitants of those places.
One interesting fanfiction could be about Jack Frost and Peter Pan teaming up to save Neverland from a new, mysterious threat. Maybe a dark magic that is freezing parts of the island and they have to combine their powers to stop it.
It really depends on the situation. In a fight, Jack Frost might seem more dominant with his ice - creating powers. He could freeze his opponents or create icy barriers. But in terms of leadership and charm, Peter Pan could be more dominant. He has led the Lost Boys for a long time and has a way of getting people to follow him. So, it's hard to say who would be more dominant overall.
One possible plot could be that Jack Frost, being the spirit of winter himself, is intrigued by Elsa's ice powers. They could start by having a friendly competition to see who can create the most magnificent ice sculptures. Their powers combined might accidentally create a new, magical ice realm that they then have to explore and protect together from an approaching threat, like a dark sorcerer who wants to steal their ice magic.
Tinker Bell can also be a great character in these fanfictions. In a story where Peter Pan and Jack Frost interact, Tinker Bell's jealousy or her helpfulness can add a whole new layer of drama or support. For example, she could be jealous of Jack Frost's new friendship with Peter and cause some trouble at first, but then realize they are all on the same side in the end.
One possible plot is that Jack Frost accidentally enters the world of Danny Phantom. Danny at first is suspicious of him but then realizes they have a lot in common. They start exploring each other's powers and end up having to stop a powerful entity from stealing their powers. It could involve a lot of action scenes where they learn to work together and use their unique skills to their advantage. For example, Danny could use his intangibility to dodge attacks while Jack freezes their opponents. There could also be some comical moments as they get used to each other's different personalities and ways of doing things.
The plot could involve Jack Frost initially being shocked to find his family. He may have thought he was the only one of his kind. His family might have been looking for him all this time. They could introduce him to the family traditions and ways of using their frost powers. And together they might go on an adventure to save their winter realm from some sort of threat.
In this fanfiction, it might also be about Jack Frost finally reuniting with his sister after a long time. He could be excited to share all his adventures with her. They might spend time reminiscing about their past, and then Jack could teach his sister how to skate on the frozen ponds he creates. There could be some comical moments too, like when his sister tries to make her first snowman and it turns out all wonky.
Well, it could be that Jack Frost is creating his icy landscapes when Sonic zooms by. Sonic is curious about this new, frosty world and Jack Frost is equally intrigued by Sonic's speed. They might start off a bit wary of each other but then realize they can team up. Maybe there's a common enemy that likes to disrupt both Sonic's green, vibrant world and Jack Frost's wintry domain. So they combine Sonic's speed and Jack Frost's ice powers to defeat this foe.
Well, it could be that Jack Frost accidentally ends up in the wizarding world. Maybe he freezes some of the Hogwarts grounds and Harry and his friends have to figure out how to unfreeze it without magic harming Jack.