A third storyline could be that Naruto is born in a world that is a fusion of the Naruto and Sailor Moon universes. He is raised by ninjas but is always seen as different because of his connection to Queen Serenity. He has to deal with the prejudice in his own village while also trying to find out more about his mother and her world. Along the way, he makes friends and enemies from both universes and has to use his unique skills to survive and thrive.
One storyline could be Naruto growing up in the Naruto world but having strange dreams and powers that he doesn't understand. As he gets older, he discovers his true heritage as the son of Queen Serenity. This leads to him having to travel to the Sailor Moon world to learn about his mother's legacy and gain control over his new - found powers.
Well, one way this could work is through some sort of multiverse or time - travel concept. Maybe in a different dimension, Naruto's origin is linked to Queen Serenity. For example, a powerful magic or jutsu could have accidentally connected their worlds, and Naruto could inherit some of the Queen's powers, like the ability to control the Silver Crystal in a new form related to chakra.
Another concept could be that Queen Serenity discovers Naruto's world and decides to send some of her magical warriors to train with the ninjas. Naruto could befriend these warriors and learn about their unique powers. In return, he could teach them some of his ninja techniques, leading to an interesting exchange of cultures and fighting styles.
Obviously Naruto himself and Queen Celestia as his mother. There could also be characters from the Naruto series like Sasuke and Sakura. They might come to the world where Queen Celestia rules to help Naruto or to explore. And from Queen Celestia's side, there could be her loyal subjects, like the ponies if it's related to the My Little Pony world where she is from. They could interact with Naruto in various ways, either being friendly or a bit suspicious of this new 'son' of their queen.
They could meet through a magical portal. Maybe a powerful jutsu in Naruto's world goes wrong and creates a portal that leads directly to Queen Serenity's realm. Or, a magical artifact in Queen Serenity's world starts to glow and acts as a gateway to Naruto's world, pulling Naruto through.
Well, a unique plot could be that Naruto is sent back in time to the era of Queen Serenity. He helps her in the fight against the Dark Kingdom, using his ninja skills and knowledge. In return, Queen Serenity gives Naruto a special artifact that helps him in his own world. Or perhaps there is a prophecy that only Naruto and Queen Serenity together can fulfill, and they have to go on a quest to figure out what it means and how to do it. This could involve meeting various characters from both universes along the way.
Obviously, there would be the queen vampire, his mother. She could be a powerful and mysterious figure, perhaps with her own motives and plans for Naruto. There might also be some vampire elders or nobles who play a role in Naruto's life, either guiding him or trying to use him for their own purposes.
Yes, there are many. You can start by looking on fanfiction platforms like Archive of Our Own. Just use the search terms 'Naruto and Queen Serenity' and then filter out the results that have any inappropriate or lemon - related tags. There are often great stories that focus on their interactions in a non - sexual way, perhaps in a crossover adventure or a friendship - building scenario.
In a 'Naruto meets Konan' fanfiction, there could be a time - travel plot. Naruto somehow gets sent back in time and meets a younger Konan. He tries to prevent some of the tragedies that happened in her life, like the death of Yahiko. This changes the future and creates a whole new dynamic between Konoha and Amegakure.
There could also be a storyline where they discover a hidden mystery in the village. Naruto's adventurous spirit and Ino's sharp mind would be perfect for investigating. As they live together and share their thoughts and ideas, they piece together the mystery. It could be something related to an ancient jutsu or a secret about the founding of the village. Their relationship would grow as they rely on each other to solve this mystery and protect the village.
Another potential storyline is a time - travel based one. Kara somehow travels back in time to Naruto's era. She has to keep her identity a secret while also trying to find a way back home. In the process, she befriends Naruto and helps him in some of his battles, using her superpowers in a discreet way. Naruto, in turn, helps her adapt to his world's way of life.