I'm not sure specifically as it depends on the individual fanfic. But generally, it might involve a story centered around Metal Sonic being in an abandoned or desolate situation. Maybe he's left behind in a ruined city or an old laboratory, and the story could explore his actions, thoughts, or how he copes in such an environment.
You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'Metal Sonic Abandoned' in the search bar and see what comes up.
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.
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.
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.
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.
One idea could be that Metal Sonic somehow ends up in the Naruto universe. He could be mistaken for a strange new type of summon or a powerful weapon. Naruto, being curious, might try to befriend it or figure out its powers.
I'm not sure about its popularity. It depends on the fan community. Some might find the dark and edgy concept interesting, while others might not like the idea of Tails being killed off in a fan - made story.
One idea could be that Metal Sonic somehow gets transported to the Naruto universe. He might be mistaken for a strange new type of summon by the ninja. Metal Sonic could then use his speed and robotic abilities to cause chaos or, alternatively, befriend some of the ninjas who are intrigued by his technology.