Well, in general, if we were to hypothetically analyze it, a sociopath in an 'erotic story' might be depicted in a very distorted way. Sociopaths in real life have serious issues related to how they interact with others. But in such a fictional and inappropriate context, it might just be used to create some sort of 'edgy' or 'taboo' narrative which is not a proper way to represent mental health conditions.
No. Naruto in the original series is a character full of positive traits like determination and kindness. While fanfiction can take different turns, most fan-authors still try to stay true to his core nature and not make him a sociopath.
A good vibe story might be the time when a community came together to clean up a local park. Everyone was smiling and working hard, creating a great sense of unity and positive vibes. People brought food and drinks to share, and by the end of the day, the park looked beautiful and the relationships within the community had strengthened.
Definitely not. Seoul Vibe is purely fictional. The creators came up with the story and its events to captivate the audience and offer an enjoyable viewing experience.