One idea could be a story where the baby in the 'baby project' has some sort of special power that the characters have to figure out how to manage. Maybe the baby can communicate telepathically and it leads to all sorts of comical and heartwarming situations as the characters try to understand what the baby wants.
Another plot could be that the baby project is a ruse by the teachers to get Draco and Hermione to reconcile the differences between Slytherin and Gryffindor. As they take on the project, they start to understand each other's houses better. The 'baby' becomes a symbol of unity for them, and they eventually fall in love while trying to raise it in the best way possible.
One idea could be exploring how Bella and Edward adjust to the new addition in their family. Maybe they struggle with protecting the baby from the vampire world's threats.
Well, perhaps in the fanfiction, the baby project is a part of a bigger magical experiment. Fred and Hermione might find that the baby they are dealing with has a connection to an ancient prophecy. They then have to figure out how to raise the baby while also fulfilling the prophecy's requirements. This could lead to a lot of character development for both Fred and Hermione as they face challenges they never expected.
One idea could be exploring Adam's adventures in an alternate universe. Maybe in this universe, he has to team up with a different version of himself to save the day. Another could be delving into his relationship with his mother before the events of the movie in a more in - depth way.
One idea could be to explore a future where Batman Beyond has to face an old enemy from the original Batman's time that has been resurrected with new, advanced technology. This would create a clash of old and new styles of combat and detective work.
One idea could be that baby Mario and baby Luigi get lost in a magical forest filled with strange creatures. They have to use their baby wits and little jumps to get through obstacles and find their way back home. Maybe they befriend a little fairy who guides them part of the way.
One idea could be that Baby Mario and Baby Peach go on a magical adventure through the Mushroom Kingdom, encountering new and strange creatures along the way. They might have to work together to solve puzzles to reach a special power - up that can save the kingdom from a new threat.
One plot idea could be that Baby 5 and Sai are on a mission together. They start off not getting along well because of their different personalities. Baby 5 is impulsive and Sai is more reserved. But as the mission progresses, they begin to understand each other's strengths and develop a mutual respect. They end up saving each other during a dangerous encounter and form a strong friendship.
One idea could be about the baby's first adventure in a magical garden. Maybe the baby discovers a hidden path and meets talking animals who teach it about the magic of nature.
One idea could be that the baby has a special power that tames the beast. For example, the baby's laughter might have a calming effect on the usually fierce beast.