Sakura would be interested in the medical knowledge in Familiar of Zero. She might try to combine it with her own ninja medical skills. And she would also be there to keep Naruto and Sasuke in check, just like she does in the Naruto world.
Naruto himself would probably be excited. He'd see all the magic and different creatures as new challenges and opportunities. He might try to befriend all the familiars and show them his ninja skills.
Naruto would likely be very curious and excited. He'd probably try to befriend everyone, whether they were humans, demi - humans or monsters. His positive attitude would be a shock to some of the more cynical characters in the Overlord world. Sasuke, on the other hand, would be more guarded. He'd assess the situation and look for ways to gain power. He might see the powerful magic and different races as a means to achieve his own goals.
Naruto might adapt by using his ninja skills. His ability to quickly learn and adapt in his own world would help him in the Familiar of Zero world. He could use his stealth and combat skills to survive and make his place.
Well, aside from Zero and the Juubi, there could be other Naruto characters as well. Maybe Naruto himself could be involved, perhaps he's curious about this new relationship between Zero and the Juubi. Or Sasuke might be there, as he often gets involved in matters related to powerful entities in the Naruto world. It's also possible that some of the Hidden Leaf Village elders could play a role, as they are usually concerned about any potential threats or strange occurrences.
Well, Louise's magic in 'Familiar of Zero' could be enhanced by the strategic thinking of 'The Gamer' protagonist. For example, if she has a spell that can create a shield, he could help her optimize it to be more powerful by using his knowledge of stats and leveling up.
If Naruto was an Ajin in a fanfiction, the characters in Naruto would have a mix of reactions. Hinata would be concerned for Naruto's well - being. She might be a bit scared at first because of his new and strange abilities, but still stand by him. The villagers, who have had a rocky relationship with Naruto in the past, might be afraid of him all over again. They could see his Ajin powers as a threat. On the other hand, Naruto's close friends like Shikamaru would try to understand what's going on and help Naruto control his powers if they can.
Sakura might be initially shocked and a bit scared of Robocop's robotic appearance. But once she realizes he's on their side, she would be interested in his technology and might even try to learn from it to improve her medical ninjutsu tools. Naruto, on the other hand, would be super excited. He'd probably want to immediately be friends with Robocop and would be eager to see what kind of cool moves he can do. Kakashi would be more cautious, observing Robocop carefully to assess his capabilities and motives.
Naruto would be thrilled. He loves being the center of attention and seeing all these stories about him would make him feel even more important. He'd probably want to meet the writers and tell them how cool he thinks their ideas are.
Some characters might be shocked. For example, Naruto himself would probably be really excited to see how his world is imagined in the future. He'd be happy to see that his story has inspired so many different ideas. Sasuke, on the other hand, might be a bit more skeptical. He'd analyze the fanfiction carefully, looking for any inaccuracies or misinterpretations of his character or the ninja world's values.
Some might be amused. Naruto characters have their own set of stories and adventures, and seeing the different and often wild ideas in RWBY fanfiction could be a source of entertainment for them.
They could have a range of reactions. Naruto would likely be excited and eager to see new stories about his world. He loves adventures and would be interested in seeing different takes on his life.