There could also be some characters from their past that come back into the picture. Maybe an old acquaintance of Gray's who has some knowledge about his family history related to pregnancy and child - rearing. This person could offer some unique insights. And on Lucy's side, perhaps a relative she hasn't seen in a while shows up to help or cause some drama during this special time.
Another character who could interact with them is their guild master. He could be concerned about how this pregnancy will affect their ability to take on jobs and contribute to the guild. He might offer some sort of support or special arrangements for them during Lucy's pregnancy. And of course, there could be some side characters from their world who interact with them in different ways, like the local merchants who provide baby supplies.
Erza could be a great supporting character. She might offer her strength and protection to Lucy during the pregnancy. Natsu could also be there, being his usual boisterous self but also showing a caring side towards the expecting couple.
Natsu would be a very likely character. Since he and Lucy are close friends in the original story, if Lucy travels back in time, Natsu might be one of the first people she seeks out. They could have adventures together in the past, with Natsu being his usual impulsive self and Lucy having to keep him in check with her knowledge of the future.
Obviously, Naruto and Lucy would be the main characters. Naruto as the son of Lucy would be at the center of the story. There might also be other Naruto -verse characters like Sasuke, Sakura, and Kakashi. They would interact with Naruto in the context of his new identity as Lucy's son.
The main characters are Gray and Juvia. Gray is often depicted as a cool - headed and powerful mage, while Juvia is a loving and somewhat obsessive (in a cute way) character when it comes to Gray.
Gray's character development could be quite significant. He might start to show his softer side more often. Usually, he's all about the ice - cold exterior, but now he has to think about a family. He could become more of a family man, putting Lucy and the baby's needs above his own. For Lucy, she'd grow in confidence. She'd have to be strong for the baby, and this would make her more assertive in the guild. She might also start to take on different roles, like teaching the younger members about family values that she's learning herself.
Natsu could be a character who betrays Lucy in some fanfictions. Maybe he gets influenced by some dark magic that makes him turn on her. Gray is also a possibility. He might be jealous of Lucy's growing power or popularity in the guild and decides to betray her for his own gain.
Obviously, Gajeel and Lucy are the main characters. Gajeel is often portrayed as a tough and strong character, while Lucy is more of a kind - hearted and intelligent one. In the context of this fanfiction, they are the ones going through the pregnancy journey.
There could also be other supporting characters from the Fairy Tail guild. For instance, Mirajane might play a role in giving advice to Lucy about pregnancy and motherhood, since she has a nurturing side. And Makarov, as the guild master, could be involved in ensuring the safety of Lucy and the future of the guild with a new member on the way.
The main characters are obviously Natsu and Lucy. Natsu is a powerful wizard in the Fairy Tail guild, known for his fire - based magic and impulsive nature. Lucy is also a member of the guild, a celestial wizard who can summon spirits using her keys.
Lucy, who is known for her celestial spirit magic, is one of the main characters. And Natsu, with his ability to control fire and his impulsive nature, is the other. In this fanfiction, they are the ones going through the pregnancy journey together.