In many fictional universes, Sonic is often depicted as one of the fastest characters. But it depends on how you define 'fast' and which fictional characters you're comparing him to.
You could also develop his character by showing his vulnerability. Maybe there's a situation where his dark powers are not enough, and he has to face his weaknesses. This can make him more relatable and complex.
Well, Sonic himself is often really popular in fanfics. He's the main character of the franchise after all. His speed and adventurous spirit make him a great centerpiece for many stories. Writers can easily create exciting plots around his adventures, battles against Eggman, and his relationships with other characters.
The character you might be in a Sonic fanfic could vary. It could be Amy Rose for your kind and determined nature, or Silver for your psychic powers and sense of justice.
Fanfic writers often portray Metal Sonic's character development in stages. At first, he's just a cold, robotic enemy, blindly following his programming. But as the story progresses, he might start to experience glitches in his system that lead to new thoughts or emotions. This could be due to exposure to Sonic's way of life or the kindness of other characters. For instance, if Tails tries to repair Metal Sonic at some point, during the process Metal Sonic could start to see things differently. Writers also might give Metal Sonic dreams or memories that are not part of his original programming, which could be a catalyst for his character growth.
It's hard to say. Modern Sonic is very fast and experienced in his own world. But Boom Sonic has his own strengths, like his more laid - back attitude which could help him think outside the box. It could depend on the situation. If it's a race, Modern Sonic might seem more dominant. But if it's about making friends or coming up with creative solutions, Boom Sonic could shine.
Classic Sonic could be the most interesting. He represents the roots of Sonic. When he meets Modern Sonic, he might be curious about all the newfangled things like Sonic's modern shoes or his new power - ups. His reactions to the modern elements would add a lot of charm to the story.
Writers show Sonic's character growth in relation to Tails by making him more responsible. In a fanfiction, Sonic could start to take on more of a mentoring role towards Tails. He teaches Tails new skills and strategies. For Tails, his growth is depicted in his adaptability. He is exposed to new challenges and he learns to adapt quickly. He might start using his inventions in more creative ways, which not only helps him in his adventures with Sonic but also shows how he has grown as a character in the context of their brotherly relationship.
Sonic himself would be very interesting. Since there are two different versions of Sonic in Sonic Underground and Sonic X, it would be cool to see how they interact. They could have a friendly competition about who is faster or better at saving the day. It would also be interesting to see how Sonic from Sonic X reacts to Sonic Underground's family dynamic, as Sonic in Sonic X is more used to his friendship with Tails and Knuckles.
I think the interaction between Sonic X's Knuckles and Sonic Boom's Knuckles would be really interesting. They both have their own sense of duty and pride, but their approaches might be different. Sonic X Knuckles is more traditional in his guarding of the Master Emerald, while Sonic Boom Knuckles might be a bit more laid - back. It would be fun to see them clash and then come to an understanding.