What are some interesting plot ideas for sonic and shadow friends fanfiction?

Perhaps there could be a plot where Sonic and Shadow are in a relationship, and Shadow becomes pregnant unexpectedly. They then have to face the reactions of their friends and foes alike. Some friends might be supportive, while foes could try to use this as a weakness against them. And they have to navigate through the challenges of preparing for a new life while still being heroes.

One idea could be that they have to team up to stop a new powerful villain who is causing chaos across different zones. This villain could be creating some sort of energy disruptions that only their combined powers can counter.

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.

One plot idea could be Dark Sonic having to face a new villain that is even more powerful and is threatening to destroy his world. He has to find a way to control his dark powers even more to defeat this foe.

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 idea could be Sonic discovers a magical land where all the characters are in an abdl state. He has to navigate this new world while also dealing with his own changed circumstances. For example, he might have to learn to control his new abilities that come with this state.

Tails is a very popular character to include. He is Sonic's best friend and his technical skills can add a lot to the story. For example, he could help Sonic and Shadow figure out some complex machinery or technology that is part of the plot.

Another plot idea is to create an alternate timeline within the 'a walking shadow' world. This could involve different events happening to the characters, leading to new relationships and challenges. For example, a character who was once an enemy could become an ally in this new timeline.

For Shadow of the Colossus fanfiction, you could write about a hidden society within the Forbidden Land. They worship the colossi in a different way than the main narrative implies. Wander stumbles upon this society during his journey. Or, you could do a fanfic where the colossi are not actually the 'bad guys'. They are guardians of something far more important and Wander is being used by the shadowy forces that sent him on this quest. And finally, a story about how the magic or energy that powers the colossi affects the wildlife in the Forbidden Land in ways not shown in the game. For instance, there could be mutated or super - intelligent animals due to this energy.

One idea could be a character discovering a hidden power within the shadows that they must learn to control. Maybe they are initially afraid of it but then realize it can be used for good.