Well, obviously Shadow and Tails are the central characters and are highly liked. Shadow's cool and brooding nature combined with his powerful abilities make him an interesting figure in these stories. Tails, with his intelligence and cute appearance, is also a favorite. Sometimes other Sonic characters like Sonic himself might make cameo appearances and are also well - received as they add more depth to the story.
Shadow and Tails are the main attractions, no doubt. Shadow's complex backstory and his transformation into an adoptive figure add a lot of depth to his character in this fanfiction. Tails, being the one who is adopted, has his own charm. His growth and development under Shadow's care are often what readers look forward to. Additionally, characters like Amy Rose, if she shows up to support or interact with them, can also be quite popular among readers.
The theme of self - discovery can also be prominent. Tails, with Shadow's influence, may start to question his own identity and capabilities. He might explore different aspects of his personality that he hadn't before. Meanwhile, Shadow may also learn more about his own capacity for kindness and nurturing through this adoptive relationship.
I really like 'Shadow and Tails: A New Alliance'. In this fanfic, an external threat forces Shadow and Tails to team up. Tails' intelligence combined with Shadow's power makes for an exciting read. The author does a great job of showing Tails' inquisitive nature as he tries to figure out Shadow's motives, while Shadow slowly starts to open up to the young fox.
The main characters are, of course, Tails and Shadow. Tails is known for his intelligence and mechanical skills. He is a fox with two tails which he can use to fly. Shadow, on the other hand, is a powerful and often brooding character with super - speed and strength.
Sonic is very likely to be involved. Since Sonic and Tails are close friends, Sonic would surely try to rescue Tails from Shadow. He would be the hero of the story, using his speed and wits to face off against Shadow.
One common theme is friendship. Since they are from different backgrounds in the Sonic universe, seeing how they form a bond in fanfiction is really interesting. For example, Tails' positive attitude can often break through Shadow's tough exterior.
Sonic would be a great character to feature. He's Tails' best friend and role model. His adventurous spirit would make for an exciting babysitting session filled with races and exploration. Another good character is Amy. She has a motherly side and would likely be very nurturing towards Tails, teaching him things like cooking or how to take care of his garden. Knuckles is also a good choice as he can teach Tails about responsibility and guarding important things.
Mario could be a great addition. Since Luigi is Mario's brother, his presence could add some family - related drama or comical moments. Sonic could also be included. As Tails' friend, Sonic's brash and confident personality would contrast well with Luigi's more timid nature.
One common theme is friendship. Since Tails and Shadow are quite different characters, exploring how they become friends or allies is often a central part of the fanfiction.
One popular 'tails and shadow fanfiction' story could be about their adventures in a magical realm. They might encounter strange creatures and have to use their unique skills to overcome challenges.
One common theme could be the overcoming of differences. Since Shadow is often seen as the brooding, dark character and Tails is the intelligent and more innocent one, stories might focus on how they bridge that gap. Another theme could be the power of friendship turning into love over time.