I'm not entirely sure as I haven't fully explored it, but generally it likely involves a story full of supernatural elements, survival challenges, and moral dilemmas as the title 'devil survivor' implies.
A fanfiction could focus on a different timeline where Yamato and Hibiki meet earlier. Maybe they start as rivals, but gradually realize they have more in common than they thought. This could lead to an interesting exploration of their relationship, from animosity to friendship and perhaps something more. Their interactions could be filled with witty banter and moments of mutual understanding.
Well, without having detailed knowledge of the 'devil survivor best story', we can assume that there would be a central character who is the key to the survival story. This character might be a young person with some hidden potential or power. Alongside them, there could be an older and more experienced character who guides the group. There may be a female character who brings a different perspective and set of skills to the survival efforts. And of course, the devils themselves can be considered as characters in a sense, with their own motives and behaviors that drive the conflict in the story.
Their abilities also complement each other. Yamato might have strategic skills and knowledge that Hibiki lacks, and Hibiki has a certain intuition and courage that Yamato could use. In a fanfiction, they could combine their strengths to achieve great things. For instance, in a battle against a powerful demon, Yamato could come up with a plan and Hibiki could execute it with her boldness. And their relationship can develop as they rely on each other more and more in these situations.
One idea could be to have characters from different universes within the 'devil survivor 2' world meet and form unexpected alliances. For example, a group of normally opposing demon summoners having to work together to face a greater threat that endangers all of their worlds.
Pairing a tech - savvy character from 'devil survivor 2' with a magic - using character from another world could be really interesting. The tech character could be fascinated by the magic, and the magic user could be intrigued by the advanced technology in the 'devil survivor 2' world. They could combine their skills in unexpected ways to face challenges, like using technology to enhance the magic or using magic to power up technological devices.
It could also be an internal identifier used by a company or a group. Maybe it's related to a game or a fictional universe that is not associated with adult themes. For instance, it could be a level or an area in a science - fiction based game.
Another good one is '999: Nine Hours, Nine Persons, Nine Doors'. It has a really interesting and mysterious plot. You are trapped on a ship with eight other people and have to solve puzzles and make choices that will determine your fate and the fate of others. The story twists and turns and keeps you on the edge of your seat.
For beginners, 'Phoenix Wright: Ace Attorney' is a great start. It has a simple enough gameplay mechanic where you just need to present evidence at the right time. The story is easy to follow and the characters are really charming. You get to be a defense attorney and solve some really interesting cases.
The novel 'The 34th Rule' is popular too. It explores the relationship between the Ferengi and the Bajorans in a unique way. It has some great plot twists and moral dilemmas that keep the readers hooked. It also gives a lot of insight into the cultures of both species within the DS9 universe.