One common theme is the exploration of forbidden love. Since they are often portrayed as rivals in the original Sonic universe, their love is seen as something that goes against the norm. Another theme is self - discovery. Shadow often has to come to terms with his feelings and figure out how this new aspect of his emotions fits into his identity.
One common theme is the idea of opposites attract. Sonic is often seen as the energetic and positive hero, while Shadow is the more brooding and complex character. Their differences draw them together in many fanfictions.
The brotherly love between them in fanfiction can also be seen in how they forgive each other's mistakes. Shadow, who can be quite unforgiving at times, might make an exception for Silver. And Silver, being the more forgiving type, would always be there for Shadow even if he made a big mistake. They might have arguments, but in the end, they always come back to each other because of this deep - seated brotherly love.
In Sonic fanfiction, the brotherly love between Shadow and Silver can be shown in various ways. For example, they might support each other during battles. Shadow, with his tough exterior, could secretly look out for Silver, who might be more naive at times. Their bond could be strengthened by a common goal, like protecting their world from a powerful enemy.
Another theme is redemption. Shadow has done some not - so - great things in his past, and in many fanfictions, Sonic's love and acceptance helps him find redemption. It shows how love can be a powerful force for change. Also, the theme of friendship - turned - love is quite prevalent. Since they start as friends or rivals, it's a natural progression in these stories.
Another reason is the creativity of the plots. Since it's fan - made, there are no real boundaries. A story could combine elements from different Sonic games or even introduce entirely new concepts. For example, a fanfic could have Shadow and Silver discover a new form of Chaos energy that changes the power balance in their world.
Another good one is 'Love Beyond Rivalry: Shadow and Sonic'. This fanfiction takes a unique approach by setting the story in an alternate universe where Shadow and Sonic are not just rivals but also potential lovers. It has a great plot that keeps you hooked from start to finish, with a good balance of action, drama, and romance.
There are quite a few out there. Another one to check out is 'Love in the Fast Lane: Sonic and Shadow'. It takes their fast - paced world and adds a layer of love to it. The author does a great job of showing how Sonic's positive attitude and Shadow's more brooding nature can complement each other in a romantic relationship. It also has some action scenes intertwined with the love story, which makes it even more engaging.
One popular trope is the 'opposites attract' concept. Since Shadow is often seen as the brooding, dark character and Sonic is the energetic, heroic type, their differences can create an interesting dynamic in fanfiction. Another is the 'forbidden love' trope, as their different outlooks and allegiances in the Sonic universe might make their relationship seem taboo. And of course, the 'saving each other' trope is also common. They might save one another from various threats, which then deepens their emotional connection.
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.