Sonic turning into a robot in fanfiction could also be a self - sacrifice situation. Suppose there's a powerful energy source about to explode and Sonic, in order to contain it, fuses with some nearby robotic parts. This would give him the ability to withstand the blast but at the cost of his normal form. His friends would be shocked at first but then try to find a way to restore Sonic. It could lead to an interesting adventure filled with emotions and high - stakes situations.
If Sonic turns into a robot in fanfiction, he might gain new abilities. For example, he could have enhanced strength and more precise control over his speed. However, he might also face problems like being hacked or having mechanical malfunctions. His friends like Tails would have to use their technical skills to help him out.
One common element in the Sonic turns into Dark Sonic fanfiction could be the role of antagonists. They might have a hand in triggering this transformation. For example, by manipulating Sonic's emotions or by using some sort of dark magic. Once Sonic becomes Dark Sonic, his relationships with his friends like Tails and Knuckles also change. His friends may try to bring him back to his normal self, which can create a lot of drama and action in the fanfiction.
In a 'Tails Turns into a Robot' fanfiction, it could be that an ancient technology is accidentally activated by Tails. This technology fuses with him and turns him into a robot. He then discovers that he has a special connection to an ancient robotic civilization. He has to navigate his new identity, learn about this civilization, and decide whether to embrace his robotic self or try to find a way back to his normal form all while facing challenges from those who fear or want to use his new - found powers.
The fanfiction could go like this. Sonic is on a mission in a spooky, abandoned town. Unbeknownst to him, it's infested with vampires. One of them manages to turn him into a vampire. At first, Sonic is horrified. His appearance changes slightly, with paler fur and redder eyes. He has to learn to live with his new condition. His friends like Tails and Knuckles are confused and a bit scared. However, Sonic discovers that being a vampire gives him the ability to sense danger from afar. He then uses this to his advantage to protect the town and his friends from an even greater evil that's lurking in the shadows. Eventually, he might find a way to reverse the transformation and return to his normal self.
The plot might involve Sonic being turned into a Pokemon by a powerful wizard in the Pokemon universe. As a Pokemon, he retains some of his speed abilities but also has to learn Pokemon moves. He meets a group of friendly Pokemon trainers who help him understand this new world. Together, they enter Pokemon battles against other trainers and gym leaders, all while Sonic tries to find a way back to his own world.
One possible plot could be Sonic accidentally getting hit by a strange energy beam during a battle with Dr. Eggman. This beam could have some sort of mutagenic effect that slowly starts to transform him into a human. As he turns into a human, he has to deal with the loss of his super speed at first. He then has to adapt to living as a human while still trying to protect his friends and the world from Eggman's new threats.
Well, one place to look for such fanfiction could be FanFiction.net. There are often many Sonic - related fanfics there. Maybe search for 'Tails turns into a robot' directly in the search bar on the site. Another option is Archive of Our Own (AO3). It has a large collection of fan works as well, and you might find some interesting takes on Tails becoming a robot in the Sonic universe.
One possible plot could be that Sonic, after being exposed to a strange Chaos Emerald malfunction, turns into a girl. As a girl, Sonic might face new challenges in terms of her identity. For example, her friends like Tails and Knuckles might initially be confused. Sonic could then have to deal with different reactions from her enemies too. Maybe Dr. Eggman would underestimate her in this new form, but she would prove him wrong by using her speed and skills in new and unexpected ways. She might also discover new aspects of her own personality that were hidden before the transformation.
Dr. Eggman would be an obvious choice. Since Sonic is now in a more vulnerable human form, Eggman could see this as the perfect opportunity to finally defeat Sonic and take over the world. He might come up with new devious plans, like creating robots specifically designed to target a human Sonic.