Well, it could be that Luna, from My Little Pony, gets into some kind of danger in a world where Naruto also exists. Maybe there are dark forces threatening Luna, and Naruto, with his ninja skills and sense of justice, decides to protect her. He might use his shadow clone jutsu to surround and guard her, or his rasengan to fend off attackers.
In this fanfiction, it could start with Luna in a vulnerable position, like being lost in a strange land. Naruto, who is always ready to help those in need, discovers her. He then takes it upon himself to protect her journey back to safety. Along the way, they might form an unlikely friendship, with Naruto sharing his stories of the Hidden Leaf Village and Luna sharing about Equestria. And Naruto uses his combat skills to keep any threats at bay.
Perhaps Luna has been targeted by an evil group that wants to use her magic for bad purposes. Naruto stumbles upon this situation and, being the hero he is, steps in. He could teach Luna some ninja - like tactics for self - defense while also using his own abilities to keep her safe. He may have to fight off demons or other villains who are after Luna.
Obviously, Naruto and Luna are the main characters. Naruto, the ninja from the Hidden Leaf Village, brings his skills, courage, and determination. Luna, from the My Little Pony world, has her own charm and magic. They are the central focus as Naruto is tasked with protecting Luna.
Perhaps in the fanfic, Luna has a nightmare about her past as Nightmare Moon. She wakes up crying because she fears that she could lose control again and turn back into that evil form. This would show her internal struggle with her own identity and the fear of repeating her past mistakes.
One possible plot is that Hiruzen discovers a plot against Naruto by some anti - Uzumaki forces. He then uses his combat skills and his network of spies to stop the threat before it reaches Naruto. He might also place some of his most trusted shinobi to guard Naruto at all times.
Perhaps in the fanfiction, Naruto is in a vulnerable state, like he's lost his powers temporarily. Mikoto, having a soft spot for him, takes it upon herself to be his guardian. She has to face not only physical threats from Naruto's enemies but also deal with the political situation in the ninja world that might put Naruto at risk. She uses her influence as an Uchiha to shield Naruto from all these dangers.
One possible plot could be that Harry is lost in the MLP world and Luna is the first to discover him. She helps him adapt to this new world filled with ponies, and as they spend time together, they start to fall in love. Along the way, they might have to face some villains from the MLP world who don't like the idea of an outsider like Harry being there.
Well, in this 'naruto son of luna fanfiction', it might involve Naruto facing new challenges. Since he's the son of Luna, perhaps there are enemies from Luna's side of the story. He could be trying to balance the expectations of the ninja village and whatever heritage comes from Luna. And he might also discover new jutsus or abilities that are related to his unique parentage.
Maybe Naruto is captured by an enemy and Tenten infiltrates the enemy base to rescue him. She uses her stealth and her ability to manipulate various weapons to take out the guards one by one.
Well, the plot could involve Fem Naruto using her ninja skills in the wizarding world of Hogwarts. Maybe she's there to protect the students from a new dark force that neither the wizards nor witches are fully equipped to handle. She could use her jutsu like shadow clones to confuse enemies or her speed to quickly reach students in danger.
Maybe it could be that Luna has some sort of connection to the world of Harry Potter in this fanfic. And an enemy from that world or a new threat steals fem Harry from Luna for some dark purpose, like using her powers for evil or as a bargaining chip.
The plot might involve Naruto learning that there are innocent people in the red light district who are being exploited in ways other than the obvious. He could start by befriending some of the residents, like the bar owners or the dancers. As he gets more involved, he realizes that there are powerful people trying to use the district for their own gain. Naruto then has to use his Rasengan and other jutsu to fight off these villains and protect the district and its people.