What could be an interesting plot in a Sonic the Hedgehog meets Fairy Tail fanfiction?

One possible plot could be Sonic accidentally running into the Pokemon world while chasing Dr. Eggman through a strange portal. He teams up with Pikachu to stop Eggman from stealing all the Pokeballs in a Pokemon center. Sonic's speed and Pikachu's electric attacks would make a great combo against Eggman's robots.

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.

Sonic and Natsu would be likely to interact first. Natsu is always eager for a challenge and when he sees Sonic's speed, he would be intrigued and want to test himself against Sonic.

One interesting plot could be the mages from Fairy Tail being transported to the world of Game of Thrones. They might use their magic to deal with the political intrigue and battles there. For example, Natsu could use his fire magic to fight against the White Walkers, adding a new element to the fight against the undead.

One possible plot could be that the characters from Sonic Underground get transported to the world of Sonic X. They then team up with Sonic and his friends in Sonic X to fight a common enemy like Dr. Eggman who has somehow become even more powerful by combining technologies from both universes. The different Sonic characters would have to learn to work together, sharing their unique abilities and skills.

It could involve Erza facing challenges in the Edolas version of Fairy Tail. Maybe she has to deal with different versions of her friends or new magical threats specific to that realm.

One possible plot could be that Sonic catches a strange virus that slows down his super speed. His friends like Tails and Knuckles would then have to find a cure while protecting Sonic from his enemies who might see this as an opportunity to attack.

Well, perhaps in this fanfiction, Shadow the Hedgehog is on a mission to find a powerful magical artifact which he believes is hidden in the wizarding world. Harry Potter and his friends get involved when they notice strange things happening around Hogwarts. Together, they form an unlikely alliance. Harry uses his knowledge of magic and Hogwarts' secrets, while Shadow uses his super speed and combat skills to overcome the various obstacles and villains that stand in their way.

One idea could be a crossover where Sonic characters gain magical abilities from the Fairy Tail world. For example, Sonic could run so fast that he creates a magic trail. Another idea is to have characters from Fairy Tail visit Sonic's world and deal with the fast - paced challenges there. They might struggle with Eggman's robots or try to race Sonic.

One idea could be that the Fairy Tail guild travels to the Naruto world somehow. They could team up with the ninja to fight a common enemy like a powerful dark magic user who has also invaded the ninja world. Maybe Natsu's fire magic could be compared and combined with Sasuke's fire jutsu in some unique ways during battles.