Well, a cool concept is the reconstruction of the world. In 'undertale after genocide fan fiction', the world that has been devastated by the player's actions might be shown in the process of trying to rebuild. It could involve new forms of leadership among the remaining monsters, new rules and social structures emerging. Also, the psychological state of Flowey could be further explored. He's already a complex character, and in the aftermath of genocide, his nihilistic view might change or intensify in interesting ways.
Some fan fictions in this area might explore the idea of time - related concepts. Maybe there are attempts to reverse the genocide through time - travel or some form of magic. This could bring up all sorts of paradoxes and moral dilemmas. There could also be the concept of a second chance for the protagonist, where they try to make amends for their previous actions. This might involve them facing the ghosts of the monsters they killed, both literally and metaphorically, and trying to earn their forgiveness.
One concept could be exploring the psychological state of the character who undertakes the genocide route in more depth. For example, how they gradually lose their sense of morality and what drives them to keep going despite the horror they are causing.
The protagonist who carried out the genocide is often a central focus. Their journey of coming to terms with what they've done is a major part of the story. Also, Sans is frequently in the spotlight. Given his awareness and his final stand in the original genocide route, fan fictions might explore his continued existence or his possible return in the post - genocide world.
Another aspect could be the expansion of the lore. In undertale overgrowth fan fiction, the lore might be developed further by combining the backstories of both universes. This could involve things like how the magic systems interact or what new threats emerge from the combination. It can also explore different endings based on these new lore developments.
One interesting concept could be an OC that is a powerful mage in the Undertale fanfic world. They could have unique spells that interact with the game's existing magic system in unexpected ways.
One interesting concept could be the discovery of new supernatural abilities. For example, a character might find they can control time in a unique way that's different from the usual time - control tropes. Another could be the discovery of a hidden supernatural realm that has its own set of rules and creatures.
One interesting concept could be alternate universes where the characters have different fates. For example, Mal could have become a successful Alliance officer instead of a rebel. Another might be relationships that develop differently, like a deeper romantic connection between Kaylee and Simon earlier in the story. And then there are concepts where new characters are introduced that change the whole dynamic of the Serenity crew.
One interesting concept is alternate universe scenarios. For example, what if Kerbal Space Program had a more advanced tech tree from the start? Another is the creation of unique Kerbal characters with their own backstories and personalities. Some fan fictions also explore different planetary systems with strange and exotic planets that are not in the original game.
One interesting concept could be exploring the backstories of the Whos in more detail. For example, how they built their unique houses or what their family traditions are.
Well, the character relationships are really engaging in fnaf fan fiction. For example, how the night guards interact with the animatronics in new and unexpected ways. Also, some fan fictions explore the idea of the animatronics having a more sympathetic side, which is different from the original game's horror - based view of them.
One interesting concept is the blend of magic and technology. In Shadowrun fan fiction, you often see how mages coexist with hackers and cybernetic-enhanced individuals. It creates a unique world where ancient spells and high - tech gadgets interact.