One interesting plot idea could be that Sans uses his mind - reading ability to prevent a major disaster in the Underground. He senses the intentions of a powerful and malevolent force before it can act and is able to rally the other characters to stop it. Another idea is that he reads the mind of a character who is secretly an ally but has been acting strange, and through this he discovers a hidden plan to save the Underground that the character was too afraid to share. Or perhaps he reads the mind of a human who has entered the Underground and discovers their true motives, which are not as bad as everyone initially thought, leading to a different kind of relationship between the human and the monsters.
Well, a plot idea could be that Sans reads the mind of Frisk. He discovers that Frisk is constantly conflicted between different choices in the game, like the choices between mercy and killing. This internal struggle could add a new layer of depth to their relationship. Also, Sans could read the mind of Papyrus. Maybe Papyrus has some insecurities that he hides well, and Sans, through reading his mind, tries to help him in a more subtle way. Another plot could involve Sans reading the minds of the other monsters in Snowdin. He could find out that some of them are actually envious of his laid - back attitude while they have to work hard, and this could lead to some comical or heart - warming interactions.
One interesting Sans Undertale fanfic is 'Inverted Fate'. It offers a unique take on the Undertale universe, with well - developed characters and an engaging plot that keeps you hooked from start to finish. Another great one could be 'Swapfell Sans - The Cold - Hearted Protector' which delves into the character of Swapfell Sans in a really interesting way, showing his complex personality.
Perhaps Naruto's dragon - summoning is linked to an ancient prophecy. In the story, as he starts to summon dragons, it sets off a chain of events where different ninja clans either try to help him or stop him, depending on how they interpret the prophecy. The dragons could also be guardians of some long - lost ninja secrets.
Another plot could be reincarnating as a human with the knowledge of the game's events. You might attempt to find a way to peacefully co - exist with the monsters right from the start, instead of the typical conflict - ridden story. You could use your knowledge to bridge the gap between the two races, perhaps by introducing new concepts or technologies to the Underground that would change their view of humans.
One idea could be that Alice finds herself in the Underground and has to navigate through the different areas using her unique sense of wonder. Maybe she befriends some of the monsters like Toriel and they go on an adventure together to find a way out for her.
One idea could be a bitty sans getting lost in a big, strange world outside of his usual tiny environment. He has to find his way back home while facing various challenges like avoiding being stepped on by giants and finding food sources. Another plot could be about a bitty sans forming an unlikely friendship with a non - bitty character, perhaps a human who at first is scared of him but then realizes his cute and friendly nature.
Well, perhaps the kidnapper is a copycat of a previous unsub that JJ helped put away. He wants to make her suffer as he believes she ruined the original unsub's 'legacy'. So he takes her to a remote location, and while she's trapped, she tries to use her profiling skills to understand his motives and find a way to escape or signal for help.
One idea could be that the animatronics from FNAF end up in the Undertale universe. They might be mistaken for strange monsters at first. The Sans character could be particularly intrigued by their mechanical nature and try to figure out how they work.
Another plot idea is a story where the antagonists from both games, such as Flowey from Undertale and the King from Deltarune, form an alliance. Their goal could be to take over both universes. This would force the heroes of both games to work together. The fanfic could explore how the different characters with their own powers and personalities interact and strategize to defeat this powerful alliance.
One idea could be that the characters from Homestuck end up in the Underground of Undertale. They might have to deal with the various monsters there while also trying to find a way back home. Maybe John Egbert could team up with Frisk and they use their unique abilities to overcome challenges like puzzles and battles.
A crossover with 'Sherlock' would be cool. Imagine Sherlock's deductive reasoning combined with the BAU's psychological profiling. They could be working on a case that involves a criminal mastermind who is playing mind games with both teams. Sherlock might initially be dismissive of the BAU's methods but then come to respect them as the case progresses.