Another idea is that Naruto, while on a mission, stumbles upon a portal that leads him to the world of the Thundercats 2011. There, he meets Cheetara and they form an alliance. They could face off against common enemies like powerful villains from both universes who are trying to take over both worlds.
Naruto's chakra control could be used to enhance Cheetara's own energy. She could channel Naruto's chakra into her attacks, making them more powerful. In return, Cheetara could use her agility to help Naruto dodge attacks more effectively while he is in the middle of using his more powerful jutsus.
A fanfiction could explore a romantic relationship between Lion - O and Cheetara. They might start to realize their feelings for each other during a time of peace in Thundera. However, they could face opposition from some of the other Thundercats who think it might interfere with their duties. But they would have to decide if their love is worth fighting for, despite the potential challenges it could bring to the group.
They could be in a story where they accidentally swap powers. Lion - O gets Cheetara's speed and she gets his connection to the Sword of Omens. This would lead to a lot of comical and also challenging situations as they try to adjust to their new abilities while still fighting the forces of evil.
Naruto would probably be very curious about Cheetara. He'd be asking her all sorts of questions about her world and her powers. Cheetara, on the other hand, would be cautious but also intrigued by Naruto's energy. They'd likely start off with some small exchanges, like Naruto showing off a simple ninjutsu trick and Cheetara demonstrating her speed. As time goes on, they'd become more comfortable with each other and start to joke around and support each other in different situations.
One possible storyline could be how the Hidden Leaf Village copes with his death. Maybe there are power struggles as different clans vie for leadership in the absence of Naruto's unifying presence.
One possible storyline could be that Kalawarner somehow ends up in the Naruto universe. She might be confused at first but then use her own skills to help Naruto and his friends in a battle. Maybe she has some unique powers that are useful against a new enemy.
Maybe in the fanfiction, Cheetara discovers a strange portal and steps through it, only to find herself in the Hidden Leaf Village. There, she meets Naruto and they start training together. Naruto teaches her some ninja techniques, and in return, Cheetara shows him how to better control his speed. They then enter a tournament together, using their combined skills to win.
In a Naruto fanfiction, Jaune Arc could start his own ninja clan. He could use his knowledge from RWBY to create a new style of combat that combines aura and chakra. Maybe he falls in love with a kunoichi and has to deal with the cultural differences between his world and the Naruto world while also facing off against powerful villains who want to steal his new - found ninja techniques.
One possible storyline could be Naruto struggling to balance his ninja duties with raising his child alone. Maybe he has to take the kid on missions sometimes, teaching the little one about the ninja world along the way. Another could be Naruto dealing with the judgment of the village as a single father, showing how he overcomes that and still raises a strong and kind - hearted child.
Well, in Naruto fanfiction, if there's a neglected baby, it might be that the baby is the offspring of a missing - nin. The village, fearing the baby could grow up to be like its parent, neglects it. Maybe the baby has a chakra nature that is considered 'cursed' in the Naruto world, like some form of dark chakra. As a result, the people around avoid the baby, leaving it to fend for itself in a cruel environment.