The Fairy Tail guild as a whole would probably work together. They'd come up with a plan that combines everyone's skills. For instance, Natsu could be the main attacker, while Gray and Erza work on defense and support. Lucy would use her Celestial Spirits for intelligence gathering and additional attacks. And Happy and Wendy would be in the back, helping out in different ways like providing air support or healing.
Happy would be flying around, providing support. He could carry small items or messages between the other Fairy Tail members. And he might even try to use his fish - shaped Exceed Beam to blind Godzilla or at least annoy it a bit. Wendy could use her Sky Dragon Slayer magic to heal any of her comrades who got injured during the fight with Godzilla. She might also try to use her magic to weaken Godzilla's attacks by creating gusts of wind to blow them off course.
Drunk Lucy could also be very argumentative. She might start debates with the more serious guild members like Erza about the silliest things, like whether or not it's proper to eat cake with a fork or hands. This would lead to some comical exchanges as the other members watch in amusement.
Natsu would be a likely candidate. He's always up for a challenge and not afraid to take on powerful opponents. He'd probably be the first to rush towards Godzilla, either to fight it or try to befriend it in his own Natsu - like way.
Well, perhaps in the fanfiction, Godzilla is a result of some dark magic experiment gone wrong in the Fairy Tail universe. The guilds have to deal with this giant creature that is causing destruction everywhere. Lucy might use her Celestial Spirits to try and hold Godzilla off while the others come up with a plan. Gray could use his ice - make magic to try and freeze parts of Godzilla to slow it down. And in the end, they find a way to reverse the dark magic and turn Godzilla back to normal or send it away.
Gray would probably use his ice - make magic to try and freeze Godzilla. He'd start by creating ice pillars to immobilize the monster's legs or ice walls to block its attacks. And if that didn't work, he'd get creative, maybe making ice clones to distract Godzilla while he figures out a better plan.
Another plot twist might be that the villains in the Fairy Tail world are the ones who summoned Godzilla, but they lose control of it. Now the Fairy Tail guild has to figure out a way to stop Godzilla while also dealing with the villains who caused the mess in the first place. It adds a layer of complexity to the story.
One popular Godzilla and Fairy Tail fanfiction might be those where Godzilla's immense power is incorporated into the Fairy Tail universe's magic system. For example, there could be a story where the Fairy Tail guild has to team up with Godzilla to fight a common enemy that threatens both the magical world and the real world that Godzilla inhabits. It could be an interesting read as it combines the action - packed nature of Godzilla battles with the magical and character - rich world of Fairy Tail.
The guild members' reactions would vary greatly. Happy, being Natsu's closest companion, would likely be excited about the fanfiction. He might fly around the guild hall, telling everyone about it and adding his own little comments about how accurate or inaccurate it is. He would definitely be protective of Natsu's image in the fanfiction, especially if it's not a positive portrayal.
Naruto's ability to communicate with animals through his chakra might play a role. He could attempt to communicate with Godzilla on a deeper level. His transformation abilities, like the Sage Mode, could give him extra strength and durability, which would be useful when dealing with the powerful forces associated with Godzilla. His summoning jutsu could also bring in other ninja animals to help in battles alongside Godzilla.
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.
Eren could be really interesting. Given his ability to transform into a Titan, he might be curious about Godzilla and try to understand his power. He could also see Godzilla as a rival in terms of power and might try to prove himself by interacting with Godzilla in some way.