One idea could be a crossover with the 'Dragon Ball' universe. Baby Naruto could meet Goku as a child and they could have a friendly sparring match. Another could be a crossover with 'One Piece', where Naruto ends up on the Going Merry and has adventures with the Straw Hat crew.
One idea could be a Naruto and One Piece crossover. Naruto and Luffy could meet and have to team up to defeat a common enemy that threatens both their worlds. Maybe a powerful dark force that can manipulate the sea and the land.
One idea could be a crossover with 'Toy Story'. The Boss Baby could end up in the world of toys and have to deal with Woody and Buzz. Maybe he tries to take over the toy hierarchy, thinking he can run things better. Another could be a crossover with 'The Incredibles'. The Boss Baby might try to recruit the Incredibles for some top - secret baby - related mission. He could use their superpowers to achieve his goals.
Some fanfictions might explore the baby's relationship with other characters. For example, how the baby interacts with Naruto's friends like Sasuke or Kakashi. The baby could be a source of joy and hope in the village, and there could be stories about how the whole village comes together to protect and celebrate the new addition to Naruto and Sakura's family.
One interesting idea could be exploring how different characters in Naruto would handle the role of being a baby daddy. For example, Naruto himself might bring his positive and determined attitude to fatherhood, teaching his child about perseverance. Another could be Sasuke as a baby daddy, perhaps dealing with his own dark past while trying to raise a child in a more positive environment.
Well, one interesting idea could be the combination of Naruto's ninja skills with the powers from another fictional universe. For example, if Naruto were to cross over with the Harry Potter universe, his chakra-based jutsu could interact in unique ways with magic. Maybe he could use his Shadow Clone Jutsu to confuse Death Eaters while wizards try to figure out how to counter it with spells.
One idea could be that Naruto characters are transported to the AOT world. Naruto's ninjutsu skills would be a huge advantage against the Titans. For example, his Shadow Clone Jutsu could be used to distract the Titans while the Survey Corps make their moves. Another idea is that the Ackermans have some sort of connection to the chakra system in Naruto. Maybe they can unlock chakra and use ninjutsu, which would completely change the dynamic in the AOT world.
One idea could be that the characters from Naruto end up in the world of Blade. For example, Naruto himself might be mistaken for a powerful being in the Blade world. He could use his chakra powers in new and unexpected ways against the vampires in that world.
One idea could be Naruto characters attending a modern-day high school. For example, Naruto could be the class clown who always gets into trouble but has a heart of gold. Sasuke might be the mysterious loner that all the girls are curious about. Another idea is a school tournament where Naruto and his friends use their ninja skills in a non - lethal way, like a sports - like competition within the school grounds.
One interesting idea could be Naruto getting the power of flight from another fictional universe. It would completely change his combat style and how he moves around the Hidden Leaf Village. Another idea might be Naruto having the power to control time, like being able to slow down or speed up time during battles. This would give him a huge advantage against his enemies.
Perhaps the Akatsuki from Naruto somehow get involved in the Avatar world's politics. Their goals of collecting tailed beasts could be translated into a search for some powerful Avatar - related artifacts. This would stir up a lot of chaos in the Avatar world and force the Avatar and his friends to team up with some Naruto characters to stop them.