The main characters would surely include Emperor Natsu. Then there might be a mysterious sorceress in the harem. She has her own secrets and powers, and her relationship with the emperor is complex. There could also be a warrior - woman who is part of the harem. She is brave and skilled in combat, and she may protect the emperor not only because of her feelings for him but also out of a sense of duty.
Obviously, Emperor Natsu is one of the main characters. He is likely at the center of the story, being the object of the harem's affections. There are probably some female characters in the harem as well. Maybe there's a strong - willed princess who is used to getting what she wants and sees the emperor as her ultimate prize. Another could be a commoner girl with a kind heart who catches the emperor's eye in an unexpected way.
Emperor Natsu is a key character, no doubt. There could be a foreign noblewoman in the harem. She brings with her different cultural elements and ideas, which add to the diversity of the harem. And perhaps there's a young girl who is an apprentice to a great scholar. Her intelligence and knowledge make her stand out in the harem, and she forms a unique bond with the emperor.
Lucy is definitely one of the most common. She has a close bond with Natsu from the start of the series. Erza is also often included. Her strong and confident personality makes her a great addition to the harem. Wendy could also be part of it. Despite her young age, she has a deep respect and admiration for Natsu.
Well, obviously Lucy from Fairy Tail would be a likely candidate. She already has a strong connection with Natsu in the original series. Then from the world of Bleach, Rukia could be an interesting addition. Her cool and collected nature would contrast with Natsu's hot - headedness, and her Soul Reaper powers would add an interesting dynamic to the harem. Also, from Attack on Titan, Mikasa could be in the harem. Her strong combat skills and protective nature towards Eren could translate into a similar protectiveness towards Natsu in the fanfiction.
Well, perhaps a plotline where the harem members have to work together to protect the emperor from an external threat. Despite their differences and rivalries within the harem, they realize that the safety of the emperor is crucial. This could involve battles, strategic planning, and the harem members using their unique skills and abilities. It also might lead to a deeper understanding and respect among the harem members.
In addition to Lucy and Erza, there could be other female characters from the series. Maybe some minor characters who have always admired Natsu from afar. For example, that one girl from the guild who always blushes when Natsu is around. Another possibility is a powerful female dragon who sees Natsu's transformation into a Dragon God as a sign of his worthiness. She might join his harem, bringing a different kind of relationship dynamic as she has her own dragon - like qualities and power. And there could be a female mage from a different guild who hears about Natsu's new status and is intrigued, eventually becoming part of his harem.
In addition to Naruto and Natsu, there could also be other important characters. For example, Sasuke from Naruto's world might make an appearance if there's a connection between the two worlds. From Fairy Tail, characters like Lucy could also be involved as she often teams up with Natsu. They could all interact in various ways, depending on the plot of the fanfiction.
Lucy could be a main character. Since she's often by Natsu's side, she would likely be deeply involved in his recovery. She could use her celestial spirit magic to try and protect him while he's injured or search for a way to heal him.
Happy, Natsu's flying cat companion, would definitely be a main character. He would be there to provide comic relief as always, but also be a source of emotional support for Natsu during his transformation into a dragon god. Erza might also be a prominent character. With her strong leadership skills and powerful magic, she could be guiding the guild during the times when Natsu is still coming to terms with his powers and the changes it brings to the guild.
Obviously Naruto would be the main character. Sakura could potentially be part of his harem, as she has a long - standing relationship with Naruto in the original series. Hinata might also be there, given her deep feelings for Naruto.
There could also be some new characters introduced specifically for this fanfiction. For instance, an ancient dragon who knows all about Natsu's true nature and acts as a mentor to him. This dragon could have a complex backstory and motives, and its interactions with Natsu and the other Fairy Tail members would be a major part of the story.
The main characters are clearly Natsu and Erza. Natsu is a hot - headed and powerful wizard, known for his use of fire magic. Erza, on the other hand, is a strong and disciplined female wizard, often seen as a leader. And in this fanfiction, they are likely to be in a situation related to a baby, which could be either taking care of it, being the parents of it, or having some other important connection to the baby.