One interesting plot could be the new human having unique powers that change the dynamic with the monsters in the Underground. For example, they might be able to communicate with certain monsters in a way that no other human has before, leading to new alliances and story developments.
A possible plot could be that the new human gets lost in a part of the Underground that has never been explored before. There, they encounter strange and new types of monsters and have to figure out how to survive and find their way back to the main path. This would add a sense of adventure and mystery to the fanfiction.
Here are some plot ideas. First, the adult human could be a scientist. They meet Toriel and start to analyze the magic in the Underground. As they collaborate, they grow closer. Second, the human might be a storyteller. They tell Toriel tales of great heroes and adventures from the surface. Toriel is so captivated that she wants to be part of those stories with the human. Third, the human has a troubled past. Toriel, with her motherly nature, helps the human heal. Through this process, their relationship blossoms. In all these ideas, their relationship can develop in a non - sexual, deep and meaningful way, exploring themes of friendship, understanding and hope.
Well, the new human is obviously a main character. They bring a fresh perspective and set of actions into the world of Undertale. Then there are likely to be some of the well - known monsters like Sans and Papyrus. Sans with his laid - back yet mysterious nature, and Papyrus with his over - the - top enthusiasm. They often interact with the new human in various ways, creating interesting storylines.
One interesting idea could be exploring new character backstories. For example, delving deeper into the lives of the new human characters before they arrived in the Underground. Maybe they had unique families or past experiences that shaped their personalities in the fanfiction world.
One interesting undertale human adult fanfiction could be about the human character's journey in the underground world after growing up and how they use their adult wisdom to face challenges. For example, they might form deeper relationships with the monster characters based on mutual understanding and respect.
One interesting plot could be a character torn between love for a friend and hate for the actions that friend has committed in the game's universe. For example, Papyrus might love Sans as his brother but hate his lazy attitude at times. Another could be a love story that develops between a human character and a monster, but there's also an underlying sense of hate from other monsters who don't trust humans. And sometimes, a plot could involve a character learning to let go of their hate and embrace love through their experiences in the Underground.
One interesting concept could be the exploration of the unique powers and personalities of each of the six human souls. They might be depicted in ways that expand on what we know from the original Undertale game, like showing how their traits interact with the Underground world in new and unexpected ways.
One interesting aspect could be the different interpretations of the six human souls. Maybe some fanfictions focus on their backstories before they ended up in the Underground. For example, a story might explore how they got their unique traits that are associated with their souls.
One possible plot could be the human adult getting lost in the Underground and Toriel finding and taking care of them. As they spend time together, they learn about each other's cultures and values. Another plot could be that the human adult has a special ability that Toriel needs to protect the Underground, so they team up. And a third plot could be that the human adult is on a quest to find a way out of the Underground, and Toriel reluctantly helps them, but along the way, they form a strong bond.
One interesting fanfiction could be where the six human souls have the ability to communicate with each other in the afterlife within the Underground. They share their memories and experiences, which gives a deeper understanding of each soul's nature.
There could be a plot where a human is cursed by an evil witch, and a good witch decides to help the human break the curse. Along the way, they form a deep bond. The human learns about the witch's world, and the witch learns about human emotions like love and friendship, which in the end, is the key to breaking the curse.