A great Werehog Sonic x Shadow fanfiction could explore their relationship in a more emotional way. For example, Sonic in his Werehog form is often seen as an outcast by some in his world. Shadow, who also has his own sense of being different, might be the only one who truly understands him. They could have deep conversations about their place in the world and how they are both trying to find their true selves.
There might be a fanfiction where the Werehog Sonic and Shadow are thrown into an alternate dimension. In this dimension, they have to face different versions of themselves and their friends. Their relationship evolves as they fight side by side, with Shadow being initially skeptical of Sonic's Werehog abilities but eventually coming to respect them.
A great Sonic the Werehog fanfiction could explore his origin in more depth. What if there were secrets about how he became the werehog that not even Sonic himself knew? It could involve ancient prophecies and dark magic that are slowly revealed throughout the story, making for a very engaging read.
They might combine their powers through a sort of energy transfer. Shadow could transfer some of his chaos energy into Sonic while he's in Werehog form, enhancing Sonic's already formidable abilities. This could also work the other way around, with Sonic sharing his Werehog - specific energy with Shadow to give him new skills or boost his existing ones.
First, you need to understand the characters well. Sonic in his Werehog form has different abilities and a somewhat different personality compared to his normal self. Shadow also has his own complex character traits. Try to incorporate these into the story. For example, Sonic's Werehog strength could be used in a fight scene against a common enemy.
A common theme is self - discovery. The Werehog often has to figure out his place in Sonic's world. Another theme is the struggle between the two forms, Sonic and Werehog.
One interesting story could be about a race between Sonic and Shadow where Amy is the prize for the winner. However, both Sonic and Shadow start to have second thoughts about using Amy in such a way during the race and end up teaming up instead. This shows a different side of their competitive relationship and how Amy can be a catalyst for change in their dynamic.
One interesting Vampire Shadow x Sonic fanfiction could be about their unexpected alliance against a common enemy. They might start off as foes but gradually realize they need each other's powers.
One popular 'werehog sonic x amy fanfiction' is 'The Moonlit Encounter'. It has a really interesting plot where Sonic in his werehog form and Amy have an unexpected adventure in a mysterious forest at night. The way the author describes their interaction is quite engaging.
One idea could be a crossover with another popular game character like Link from The Legend of Zelda. Sonic the Werehog could find himself in Hyrule and have to team up with Link to defeat a common enemy. Maybe Ganon has somehow tapped into the power of the Chaos Emeralds and Sonic's werehog form is needed to counter it due to its unique strength and agility in that form.
One interesting plot could be a vampire Sonic having to team up with a werehog to protect their camp from an outside threat, like a powerful dark force. They have to overcome their natural differences and learn to work together.
One common theme is adventure. The reader often joins Sonic the Werehog on his quests, facing various challenges and enemies together.