One possible plotline could be Naruto trying to protect Nora from the threats of the Grimm while also teaching her some of his ninja skills. Another could be Nora growing up with a split identity, feeling part of the RWBY world but also having a connection to Naruto's ninja heritage. Maybe she would struggle to fit in at Beacon Academy because of her unique background.
A plotline might involve Naruto being in hiding in the RWBY world and Nora not knowing who her father really is at first. As she discovers her true heritage, she has to deal with the fact that she is part - ninja in a world that doesn't really understand that concept. There could also be a plot where Nora uses Naruto's techniques to fight against new and powerful enemies in the RWBY universe that are beyond what the normal Huntsmen can handle.
Well, in fanfiction, anything can happen. If Naruto is the father of Nora in a RWBY fanfic, it's likely the writer wanted to do a really unique crossover. Maybe they found some similarities in their characters' traits like Nora's strength and Naruto's never - give - up attitude and decided to blend their stories in this strange but interesting way. But in the official RWBY and Naruto canons, this is completely unheard of.
One possible plotline could be about the challenges of raising the babies in the RWBY universe. There might be difficulties with protecting them from Grimm while also teaching them the ways of combat and survival.
Perhaps there is a common enemy that forces Captain America and the RWBY characters to work together. This enemy could be a powerful being that has the ability to manipulate both the technology in Captain America's world and the Dust in RWBY's world. The combined forces of the two universes would have to find a way to defeat this enemy and in the process, learn from each other's strengths and weaknesses.
A possible plotline could be that a new enemy emerges in the RWBY world, a puppet master who starts to take over the minds of the hunters and huntresses. The RWBY team has to figure out how to stop this enemy before everyone they know becomes a puppet under the enemy's control.
Well, in this 'naruto father of rwby fanfiction', it could be that the author has created a really unique story. Maybe Naruto has been brought into the RWBY world and due to certain events, he ends up taking on a fatherly role to one of the RWBY characters. It could be a story full of action and adventure, with Naruto's ninja skills mixing with the unique abilities in RWBY. It might also explore how Naruto's values and experiences shape his new role in this different universe.
Maybe a group of villains in the RWBY fanfiction are trying to summon Dark Naruto to use his power for their own evil purposes. The RWBY heroes find out about this plan and have to stop the summoning. Along the way, they meet some characters from the Naruto universe who are also trying to prevent the misuse of Dark Naruto's power.
Another plotline might be that Jaune is framed for a crime he didn't commit and decides to disappear to clear his name. He goes into hiding and starts his own investigation, all while his friends in RWBY are trying to figure out what really happened and whether he's actually guilty or not.
Perhaps a plotline where the values that Mao Zedong represented, like equality and the fight for the common good, are transferred to the RWBY universe. The RWBY characters could be inspired to fight not just for themselves but for all the people in the kingdoms. They could start new initiatives like ensuring equal access to training for all those who want to be huntsmen or huntresses, similar to how Mao Zedong fought for the rights of the common people in China.
Maybe a plot where Glynda's telepathy is somehow affected by an outside force. This could lead to her losing control over it at times and causing chaos, and she has to find a way to regain control and fix the problems it causes. It could also involve her learning more about her own power through this struggle.
One plotline could be that Penny is hacked by an enemy and turned into a brainwasher to manipulate her friends in RWBY. This would create a lot of internal conflict as the team tries to figure out what has happened to her.