One idea could be that the character relives their childhood during a magical time - like a time - traveling accident. They get to see their old friends and family members as they were, and re - experience the simple joys of childhood like playing in the park or having ice cream on a hot summer day.
Maybe the character wakes up one day and finds themselves in their childhood body but with all their current memories. They could then use this knowledge to change things in their past that they regretted, like standing up to a bully or being nicer to a certain friend. This would lead to a whole new set of adventures and self - discovery.
A great plot could be that in this 'a kid again' scenario, the character discovers a hidden talent they had as a child but lost as they grew up. For example, they could find out they were an amazing artist or singer when they were little. They then have to decide whether to pursue this talent again in their present life or just enjoy the rediscovery of it during their time as a kid once more.
One idea could be exploring MK's training in more detail. Show his struggles and how he overcomes them. For example, he might face a new and extremely powerful demon that forces him to master a new skill quickly.
One idea could be that the characters find themselves in a time loop where they have to 'begin again' multiple times in different scenarios. For example, they might relive a day but with different challenges each time.
Perhaps a story where a character loses their love due to a misunderstanding, but then through a series of events, they are brought back together. It could involve self - discovery for both characters, realizing that their love was always meant to be, and they have to love and love again after learning from their past mistakes.
One interesting plot idea could be a time - travel scenario where a character from the present goes back to a key moment in the Twilight story and changes something small that has big consequences. For example, changing the first encounter between Bella and Edward, which could lead to a completely different relationship dynamic.
A possible plot could be that Mike, in his 17 - again form, discovers a hidden talent of Scarlett's that she has been too shy to show. He then encourages her to pursue it, and this brings them closer together.
A plot could revolve around a kid Natasha joining the Avengers on a time - traveling adventure. They go back in time to stop an event that could change the future of the Avengers. Along the way, Natasha has to use her wits and natural skills to overcome various obstacles, and she forms a special bond with the other Avengers members during this journey.
One idea could be a story where young Kakashi has to protect a young Naruto from a group of rogue ninjas. It could show Kakashi's early skills and Naruto's innocent yet determined nature.
One plot idea could be Kid Gilgamesh crossing over into a modern - day world and having to adapt to modern technology while still maintaining his pride and power. Maybe he gets into battles with modern superheroes who underestimate him at first.
One idea could be a time - travel plot where Boruto goes back in time and meets kid Naruto. He could help Naruto in some of his early struggles and they form an unexpected friendship. This would also allow for some humorous moments as Boruto tries to explain modern things to Naruto.
Another plot could be that Damon becomes human again to be with a human he loves. But once he is human, he realizes that the world he thought he knew as a vampire is very different. He has to start from scratch in building relationships, getting a job, and learning how to live without his vampire powers. He also has to face the jealousy and hatred from some vampires who see his transformation as a betrayal.