Well, Shinji would be very apprehensive. He's used to the relative predictability of the Angels in a sense, but Godzilla is a whole new level of unknown. His first instinct would be to avoid conflict if possible. Asuka would be boastful at first, claiming she can easily defeat Godzilla. But as she realizes the true power of Godzilla, she might become more cautious. Rei would be the most open - minded among them. She could potentially see Godzilla as a being with a purpose, not just a mindless monster. Misato would be in a state of high alert. She'd be gathering all available data on Godzilla, and trying to come up with a battle plan. Gendo would be watching from the shadows, thinking about how this new variable fits into his grand scheme.
Shinji might initially freeze when he sees Godzilla. He has self - doubt issues, and facing such a colossal creature would only magnify those. Asuka would be defiant and rush into battle, believing her skills and the power of her Eva are enough. Rei would approach Godzilla with a sense of curiosity. She might sense something different about this 'enemy' compared to the Angels. Misato would be scrambling to get information. She'd be trying to figure out if Godzilla has any weaknesses, and would be coordinating with the other NERV staff. Gendo would be calculating. He might be thinking about how Godzilla could be used to further his own goals, whether it's related to the Human Instrumentality Project or something else.
Shinji would probably be terrified at first. He's already hesitant and scared in his normal battles, and Godzilla is much larger and more intimidating than the Angels he usually faces. Asuka would likely be more aggressive, thinking she can take on Godzilla with her Eva. Rei, on the other hand, would be very calm and observant, trying to understand Godzilla's nature. Misato would be in a panic initially, but then quickly start strategizing on how to deal with this new threat. Gendo would see Godzilla as either a new opportunity or a major obstacle depending on his long - term plans.
Most of the shinobi would be terrified at first. Naruto, being the curious and brave one, would probably be the first to approach Godzilla. Sasuke might be more cautious, seeing Godzilla as a potential threat. Sakura would be worried about the safety of the village. The older shinobi like Kakashi would try to analyze the situation and figure out how to deal with this unknown giant creature.
Ruby would probably be both scared and fascinated. She's always been curious about new things, and Godzilla is definitely something new. But she would also be worried about the destruction it could cause. Weiss might be more cautious and initially see Godzilla as a threat to the order in Remnant. Blake would likely be on guard, observing Godzilla's behavior to see if it's truly hostile or not.
Definitely the Eva pilots, Shinji, Asuka, and Rei. They are the main characters in Evangelion and would be at the forefront of dealing with Godzilla's appearance in their world.
Naruto would probably be both amazed and a bit scared at first. But being Naruto, he would quickly jump into action. He might try to use his rasengan against Godzilla, thinking it could do some damage. However, he would soon realize that Godzilla is much more powerful than he initially thought and would have to come up with a different strategy, like using his speed to avoid Godzilla's attacks and find its weak points.
Naruto would probably be very curious about Godzilla. He might try to talk to it, even though Godzilla can't really communicate in the same way. He'd likely use his friendly and fearless attitude to approach Godzilla. Godzilla, on the other hand, might just see Naruto as a small, insignificant being at first. But as Naruto shows his determination and power, Godzilla might start to respect him in a way.
It could be about Godzilla emerging in the world of Evangelion. Maybe the Angels in Evangelion are confused by this new giant monster. The Eva pilots might have to deal with both Angels and Godzilla at the same time.
Some of them might be amused. For instance, Hulk could find it funny if Godzilla was shown as being weak in the fanfiction. He might laugh and say 'That big lizard not so tough!'.
A possible plot idea is that Godzilla is drawn to the Geo - Front in Evangelion. The reason could be the powerful energy sources there. The NERV organization is then forced to either work with Godzilla or find a way to get rid of it. They might study Godzilla's biology to see if they can use any of its abilities to enhance the Evas. Another plot could be that an Angel takes on the form of Godzilla to deceive the Eva pilots. This would make the pilots question their usual tactics when facing an 'Angel' as Godzilla has different strengths and weaknesses compared to the normal Angels. Also, a plot where Godzilla's presence causes a shift in the power dynamics between the different factions in Evangelion, like SEELE and NERV, could be really interesting.
Yang would be a likely character. She's bold and not one to back down from a challenge. She might see Godzilla as a huge opponent to test her strength against. Maybe she'd start off trying to punch it, only to realize that brute force alone won't work and then have to figure out a more strategic way to interact with it.
Godzilla might see the pregnant Muto as a threat. After all, Mutos are his enemies. So he could start hunting it down to prevent more Mutos from being born.