One idea could be that they are all babies in a magical nursery where the toys come to life and help them discover their musical talents. For example, a singing teddy bear could be their first music teacher.
A third plot idea is that they are all babies in a daycare center that is secretly a music academy for the most talented tots. They form a band without really knowing what they are doing, just by making cute baby noises that turn into a unique melody. Their first 'concert' could be for their parents at the daycare's end - of - year show.
One idea could be that the boys reunite for a special charity concert. They each bring their own unique musical growth from their solo careers and blend it into a new sound for the concert. It could be a chance to heal old wounds and reignite their friendship on stage in front of their fans.
One idea could be the little sister joining One Direction on tour. She could have her own mini - adventures at each stop, like trying local foods and making new friends. Another could be that she has a secret talent for songwriting and helps the boys come up with new hit songs.
There are fanfictions where the 'One Direction Babies' grow up in a world full of music and fame. They might inherit their fathers' (the One Direction members) talents and face the challenges of being in the public eye from a young age. In some stories, they form their own little band, inspired by their dads' success.
One idea could be that the members of One Direction are secretly wizards and they end up at Hogwarts. They could form a new club there, combining their muggle music with magic. For example, they use spells to make their instruments play on their own during a concert at Hogwarts.
One idea could be a fanfic where the main character gets to go on a world tour with One Direction. They experience all the backstage craziness, like pranks among the band members and impromptu jam sessions.
One idea could be a crossover where the members of One Direction and Big Time Rush meet at a music festival. They start collaborating on a song and face some challenges along the way, like creative differences. Another could be a time - travel fanfic where the groups are transported to each other's eras. For example, One Direction goes to the Big Time Rush era and experiences their kind of stardom and vice versa.
One idea could be that their babies inherit unique powers from both parents. For example, they might have Hellboy's strength and Liz's ability to control fire, but in new and unexpected ways. Maybe they use these powers to protect the world from a new, unknown threat that the regular heroes can't handle.
One interesting idea could be exploring how the babies inherit the unique ninja abilities of their parents at a very young age. For example, a baby of Naruto might show early signs of being able to control the Nine - Tails' chakra in a cute and unexpected way.
One interesting idea could be the superpowers the babies inherit. For example, a baby of Iron Man might show an early aptitude for technology or engineering. Another could be how the other Avengers interact with the babies, like Thor trying to teach them about Asgardian culture in a really fun and comical way. And also, there could be a plot where the babies are in some sort of danger and the Avengers have to use their unique skills to protect them.
Well, one interesting idea could be seeing how the characters' magic powers might be passed down or manifest in their baby forms. For example, if Natsu's child might have some sort of fire - related magic from a very young age. Another idea could be the relationships between the different baby characters, like who would be friends and who might have little rivalries.