One plot idea could be that Naruto is somehow transported into the world of SAO. He meets Asuna and they team up to fight the bosses in the game. Naruto's unique abilities like shadow clones could be used in creative ways during battles, for example, sending clones to scout different areas of a dungeon while he and Asuna strategize. Another idea is that a new threat emerges in both the Naruto world and the SAO world simultaneously, and they have to use the skills from both universes to stop it. Maybe Asuna learns some of Naruto's ninja techniques to enhance her combat skills in SAO.
A possible plot could be that Asuna gets trapped in a strange virtual world that has elements of both SAO and the Naruto universe. Naruto discovers her there and decides to help her get back home. Along the way, they face challenges where Naruto's chakra and Asuna's sword skills are both needed. They also meet characters from both worlds who are also trapped, and they have to work together to find a way out. For instance, they might encounter Kakashi in the virtual world, and he gives them some advice on how to use their combined powers effectively.
One idea could be a character having a bloodline that combines Naruto's Uzumaki chakra with Sao's game - like abilities. For example, they could have the Uzumaki's massive chakra reserves which they use to power up unique Sao - style skills in combat, like super - fast sword strikes enhanced with chakra. Another plot idea is a story where the bloodline causes a rift between different factions. Some see it as a threat while others as a new hope for their world. This could lead to all kinds of political intrigue and battles.
Maybe the wedding is a secret affair at first. Kirito and Asuna decide to elope and have a small, private ceremony in a beautiful, secluded location within the game. They could face some challenges during the planning, like dealing with in - game enemies who try to disrupt the event. And then later, they surprise their friends with the news.
Well, they could have a baby that is a sort of bridge between the real world and the virtual world. In the fanfiction, the baby might be able to bring elements from the virtual world into the real world in a harmless but amazing way. For example, virtual flowers could start growing in their real - world garden. But this also causes some problems as some people in the real world start to get jealous or scared. Kirito and Asuna then have to deal with these real - world issues while also raising their baby in both worlds.
Naruto is very outgoing and energetic. He would probably be really excited to meet Asuna and immediately start asking her all about the SAO world. Asuna, on the other hand, is more reserved at first but is also strong - willed. She might be a bit cautious around Naruto at first because of his boisterous nature, but she would soon come to appreciate his positive attitude. Naruto's never - give - up attitude could inspire Asuna when they face difficult situations together in the fanfiction.
One idea could be that the main characters from Sao end up in Ggo due to a strange glitch in the virtual world systems. They have to adapt to Ggo's different rules and combat styles while also trying to find a way back to their own world in Sao.
One idea could be a crossover of the combat styles. For example, the characters from RWBY could learn some new sword techniques from SAO and incorporate them into their own fighting. Another could be a scenario where the characters are trapped in a virtual world similar to SAO but with the Grimm from RWBY. They would have to fight the Grimm while also dealing with the rules of the virtual world.
A great plot idea is Naruto being mistaken for a spy in Kumo. He then has to prove his innocence while also trying to understand the politics and power plays in Kumo. This could lead to him making new friends and enemies within the village. Or perhaps there's a prophecy in Kumo that Naruto is somehow a part of, and he has to figure out his role in fulfilling or changing that prophecy.
In some fanfics, a plot twist could be that Naruto has a hidden ability that is related to the SAO world's system. For example, his chakra can disrupt the game's coding in unexpected ways. This throws both him and Asuna into a whole new set of challenges and mysteries to solve.
One idea could be the gamer discovers a hidden quest that no one else has found in Sword Art Online. They have to solve complex puzzles and defeat powerful bosses alone to complete it.
A really interesting plot could be that their pregnancy is a sign of a new era in the Sword Art Online world. The virtual world somehow starts to change in response to their unborn child. They could go on a quest to figure out what this means for the future of the world and their family. There could be prophecies involved, and they have to deal with various factions that have different views on what their baby represents.