I'm not sure specifically as there could be various interpretations in such a fanfiction. Maybe Metal Sonic sets Sonic up in a way that makes Sonic look bad to the other characters, perhaps by faking some evidence or causing chaos and making it seem like Sonic's fault.
Well, in some Sonic fanfiction, the idea of Sonic getting framed by Metal Sonic can involve a complex plot. Maybe Metal Sonic sets up Sonic to look like he's done something wrong, like stealing a chaos emerald or causing chaos in the city. It could be part of a villain's scheme to turn Sonic's friends against him.
Often, it begins with Metal Sonic being given some sort of motivation by an outside force or just his own envy. He then starts to plan how to frame Sonic. He might first create a false identity or a false trail that leads back to Sonic. This could be as simple as leaving Sonic - like items at the scene of a 'crime' he's supposed to have committed.
Well, Sonic is obviously a main character since the whole concept is about him getting framed. Tails is often another main character. He could be initially misled into believing Sonic is guilty but then start to have doubts and help Sonic prove his innocence.
One possible plot could be Sonic being framed for stealing the Chaos Emeralds. He then has to go on a journey to prove his innocence while facing his friends who have turned against him.
Well, it could mean that in this fanfiction, Metal Sonic is created by roboticizing Sonic. It might explore themes like the nature of identity when a character is transformed into a robotic version. Maybe it also delves into the power dynamics between the original and the roboticized form.
There could be. Given the creativity of fanfiction writers, they might find interesting ways to blend the Naruto universe with the Sonic universe, specifically with Metal Sonic. It could involve Naruto being transported to the Sonic world and having an encounter with Metal Sonic, or perhaps some sort of power - related connection between Naruto's abilities and Metal Sonic's characteristics.
In a Metal Sonic x Sonic Fanfic, the action and adventure aspects can be really exciting. Writers may create new challenges for Sonic and Metal Sonic to face together or against each other. For example, they could be forced to team up to defeat a greater evil that threatens their world. This kind of fanfic also gives a chance to delve into the emotions of the characters. Metal Sonic, although a machine, might show signs of evolving emotions or at least a form of artificial intelligence - based loyalty or rivalry towards Sonic.