The plot might involve Natsu being transported to the RWBY world by some sort of magic mishap. Once there, he discovers that his powers are both similar and different to the Dust - based abilities in RWBY. He could get involved in the Beacon Academy story, either as a student or as an outsider helping out. His fiery nature might clash with some of the more reserved characters at first, but over time, they all learn to work together and respect each other's strengths.
In this fanfiction, perhaps Natsu's magic causes some chaos in the RWBY world at first. He might have to learn the rules of the Huntsmen and Huntresses while also teaching them a thing or two about his own brand of combat. For example, his Fire Dragon Slayer magic could be a powerful asset against the Grimm, but he'd need to figure out how to work with the RWBY teams' strategies. He could also form interesting friendships with Ruby, Weiss, Blake, and Yang, each character bringing out different aspects of his personality.
Well, it could be about Natsu finding himself in the RWBY universe and having to adapt to the different combat styles there. Maybe he teams up with the RWBY characters to fight a common enemy.
Definitely Ruby Rose. Since she's the main protagonist in RWBY, it's likely that Natsu would cross paths with her first. Their personalities are quite different, with Ruby being more innocent and Natsu being more brash, so their interactions would be interesting.
Well, it could be about the adventures that the RWBY characters from CFVY and RNJR go on together. Maybe they are on a mission to fight some new Grimm threats. They might discover new abilities or form new friendships along the way.
One possible plot could be that Harry Potter enters the RWBY universe through the veil. He might bring his magic skills and knowledge with him. He could then interact with the RWBY characters, perhaps teaching them some new spells or learning about their unique abilities. His presence could also disrupt the balance in the RWBY world, leading to new conflicts and alliances.
Well, he might use his fire magic to battle the Grimm. His combat skills from his own world could give him an edge in RWBY's dangerous setting.
Well, in 'rwby neo goes to beacon fanfiction', Neo could be exploring the Beacon Academy. She might be trying to find a place for herself among the students there. It's possible that she'll cross paths with the main RWBY characters and have some interesting interactions with them. For example, she could team up with them in a mission or have a friendly sparring session.
Well, it could be about Naruto somehow ending up in the Fairy Tail world and meeting Natsu. Maybe they team up to fight a common enemy. Naruto's jutsus and Natsu's dragon slayer magic could combine in interesting ways during battles.
It could be Zeref. If Natsu goes back in time, Zeref might have different plans or be in a more powerful position at that time. He could be the main obstacle for Natsu to overcome, especially if Natsu is trying to change things related to the dark magic that Zeref wields.
The plot might involve Natsu being lured into a trap by a false Dragonoid. Since he has a strong connection with dragons, the false Dragonoid could trick him into a place where he's trapped. He would then need to figure out how to escape and expose the false Dragonoid for what it really is.
One possible plot could be that they discover the pregnancy and then face challenges together. Maybe they have to deal with the reactions of their friends in the guild, some being happy and supportive while others might be worried about how it will affect their adventuring lives.
The plot might involve Natsu and Mirajane finding a baby dragon in the form of a human baby. Since Natsu has a connection with dragons, he feels a special bond. Mirajane, with her kind heart, steps in to help raise it. They face challenges like protecting the baby from dark guilds who might want to use the baby's power.