It could also be Makarov. As the guild master, he has a sense of responsibility towards all his guild members. He might have some secret magic or knowledge that could be used to revive Gajeel in a moment of great need for the guild.
Well, Minato could be one of the characters. He was Naruto's father and died when Naruto was just a baby. Reviving him would allow Naruto to finally have a proper father - son relationship. Another possibility is Neji. His death was quite tragic during the war, and his revival could bring some interesting plot developments in the fanfic, especially in terms of his relationship with Hinata and the rest of the Konoha 11.
He'd probably be stunned at first. Just stand there with his mouth open a bit. Then, he'd break into a big grin and hug Levy tightly.
One interesting plot twist could be that when Gajeel is revived, he has some new and unexpected magical powers. Maybe he can now control a different type of magic that was previously unknown to him and his allies. This new power could put him in a unique position within the story's power dynamics.
In some fanfictions, Naruto might use some super powerful jutsu he created or mastered. Maybe it's a new form of Sage Mode that can reverse time on a small scale. Another possibility is that he found some ancient forbidden technique hidden in the Uzumaki clan's secrets.
Maybe an old enemy who was thought to be defeated but has somehow returned stronger. Orochimaru could be a possibility. He was always obsessed with power and immortality. If Naruto is revived, Orochimaru might see it as an opportunity to study Naruto's new state of being (since he was revived) and use that knowledge for his own dark purposes.
Gajeel would probably become more gentle and caring towards Levy. Levy, in turn, would trust Gajeel even more with her life and the life of their unborn child. Their relationship would shift from just being a couple in love to soon - to - be parents, which means more responsibility and a deeper bond.
Emotionally, Naruto would have to deal with a whole new set of family relationships. He grew up without his parents, and now having them back would be a huge adjustment. He might struggle to fit into a 'normal' family dynamic, and there could be some friction as they all get to know each other again.
Yes, there might be such fanfics in the Fairy Tail fanfic community. However, not all of them are easy to find. Some fanfic platforms might have specific search filters that can help you locate them.
Often, it could be fans who are really invested in the Katniss character. People who have been following the Hunger Games series closely and have a deep understanding of her character arc. They might be female fans who can relate to the idea of pregnancy and motherhood, wanting to project that onto Katniss. But it could also be male fans who are interested in exploring different aspects of the story and Katniss's relationships through this new plotline.
The Yiga Clan could be likely kidnappers. They've always been enemies of Link and would love to get their hands on him. They might see kidnapping him as a way to stop him from interfering in their plans. Another possibility is the Gerudo thieves. Although not all Gerudo are bad, there could be a group of them who think Link has something valuable and decide to take him hostage.