One idea could be a crossover where Sonic meets characters from other popular franchises in a fanfiction. For example, Sonic could meet Mario and they have to team up to save both their worlds from a common threat. Another idea is a time - travel fanfiction where Sonic goes back in time and meets his younger self, leading to some self - discovery and adventures. Also, a fanfiction about Sonic meeting a powerful new villain created by a fan could be really exciting.
For sonic meets fanfiction, we can think of a story where Sonic accidentally enters a parallel universe through a portal created by fanfiction magic. In this parallel universe, all his friends are different versions of themselves. He might find a Tails who is more of a daredevil or a Knuckles who is more laid - back. This would lead to some really interesting character interactions. Another interesting idea is a fanfiction that explores Sonic's origin in a new light. Maybe there are secrets about his past that are only revealed when he meets a mysterious character in the fan - created story. And a story where Sonic has to compete in a series of challenges set up by a powerful fan - made entity would also make for an engaging fanfiction.
A possible plot for 'sonic meets sonic boom fanfiction' is that a strange rift in the dimensions brings Sonic and his friends from the classic Sonic world into the Sonic Boom world right when they are about to have a big celebration. However, the Sonic Boom characters are initially suspicious of these new arrivals. But as they start to realize that a common enemy is behind the rift, they join forces. Sonic and Sonic Boom Sonic could have a friendly competition to see who can defeat the most badniks during the adventure, which also helps them bond and understand each other's strengths better.
One interesting idea could be the clash of their different power systems. Goku has his ki-based attacks and Super Saiyan forms, while Sonic has his speed and Chaos Emerald powers. Maybe they could have a friendly sparring match to test each other's abilities.
One idea could be that Bendy and Sonic find themselves in a strange, in - between world where the art styles of their respective universes start to blend. They have to team up to find a way back to their own worlds. Maybe there are some glitches in this new world that they need to fix together.
One idea could be that Sonic from Sonic X accidentally travels to the Sonic Boom universe and has to adapt to the different environment and new versions of his friends. Maybe he teams up with Sonic Boom Sonic to defeat a common enemy that has found a way to cross between the two universes.
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.
A possible plot is that a strange force is corrupting the Freedom Fighters, and Sonic has to find a way to save them and also figure out what's causing this corruption. This could involve a lot of action as Sonic races against time to free his friends and stop the source of the evil.
One idea could be Sonic's speed causing chaos among the Justice League at first. For example, he might accidentally disrupt Batman's plans during a Gotham operation. Another could be Sonic teaming up with The Flash to outrun a common enemy that is threatening both their worlds. Maybe they have a friendly race while also trying to lead the bad guy into a trap.
One idea could be that Sonic Underground's siblings get separated in a new zone and Shadow accidentally stumbles upon them. He initially thinks they are enemies but then realizes they are on the same side against a common foe. Another could be that Shadow is on a mission related to the Chaos Emeralds and crosses paths with Sonic Underground. They end up having to team up to stop a new villain who wants to use the power of music and the Chaos Emeralds for evil.
In a 'sonic meets pokemon fanfic', it could be interesting if the Pokemon themselves gain some of Sonic's abilities. For example, a group of Pikachu learn to run at Sonic - like speeds after being exposed to some chaos energy. This new ability changes the way Pokemon battles work in the region, and Sonic has to help the Pokemon trainers adapt to these changes while also dealing with an antagonist who wants to use this new phenomenon for their own evil purposes.
Sonic, of course, is a must - have. But also Knuckles from both universes. In Sonic Boom, Knuckles is a bit more of a muscle - brained character in a fun way, while the classic Knuckles is more serious about guarding the Master Emerald. When they meet, there could be some hilarious misunderstandings at first, like Sonic Boom Knuckles trying to show off his strength to the other Knuckles, but then they end up teaming up against a common threat.