One idea could be that a human accidentally stumbles upon a time - related artifact that starts the transformation process into a time baby. As a time baby, they have the ability to briefly glimpse into different time periods, which they use to prevent a great disaster in the future.
One idea could be that as Bill turns human, he has to deal with human emotions like love and empathy for the first time. He might struggle to understand why people cry or laugh, which could lead to some comical and also poignant moments.
One plot idea could be that an ancient spell backfires on Inuyasha. Kagome has to take care of baby Inuyasha while also trying to find a way to reverse the spell. Maybe she has to search for a rare herb that only grows in a dangerous, demon - infested area.
A good plot could involve Inuyasha turning human at unexpected times. This creates a lot of chaos as his friends are used to his demon form. For instance, they might be in the middle of a battle with a powerful demon, and suddenly Inuyasha turns human. His friends then have to protect him while also trying to figure out how to turn him back. It could also be interesting if his human form has some sort of hidden power or connection that they discover during this time.
One plot idea could be that Erin, after turning into a werewolf, tries to hide it from her family and friends. She struggles with the new instincts and the fear of hurting those she loves. Another idea is that she discovers there's a whole underground community of werewolves and has to learn their rules and ways to survive. Or perhaps she meets a vampire who is intrigued by her new werewolf status and they form an unlikely alliance.
Another plot could involve a human who is a scientist from the modern world accidentally traveling back in time to the 'Land Before Time' era. This human could try to study the dinosaurs' behavior and in the process, discovers a way to communicate with them on a deeper level, leading to some heart - warming and adventurous interactions.
Maybe baby Naruto time travels to a time when the Uchiha clan was still thriving. He could interact with the young Sasuke's family and somehow change the course of events that led to the Uchiha massacre. This would create a whole new timeline with different challenges and relationships.
Perhaps Naruto time - travels and ends up in a world where he is a baby again but with all his current powers and knowledge. He has to figure out how to use his abilities at such a young age without revealing too much. This could lead to some really comical and heartwarming moments as he interacts with the people around his baby self.
Another aspect could be that Naruto's baby form has some unique abilities or auras. Maybe his presence as a baby has a calming effect on some of the more aggressive characters in the Naruto world. His friends could also discover new things about his past or his family through his baby state, like finding a hidden mark on his body that gives clues about his heritage.
One idea could be that in this fanfiction, Wolverine turns into a baby due to a powerful mutant's accidental spell. The X - Men then have to take care of him while also trying to find a way to reverse the transformation. They might discover new aspects of Wolverine's personality as a baby, like his unwavering determination is now shown through his attempts to crawl towards danger.
There are numerous possible plotlines. For example, Sookie could discover new and unique vampire abilities that are different from the typical vampires. She might use these abilities to protect her loved ones. Additionally, she could explore the history of vampires in a way she couldn't as a human. She may find out secrets about the origin of vampires that could change the way she views herself and the vampire world. Her relationships with other supernatural beings would also change. Some might fear her new power, while others might seek her alliance.