Obviously, Naruto is one of the main characters. In the context of this fanfiction, he is the one who gets involved with the Alvarez Empire.
Zeref, of course. He is a central figure in the Alvarez Empire. His power and his role as the emperor or leader make him a crucial character to include.
One interesting story could be about Naruto joining the Alvarez Empire and having to adapt to their different culture and ways of doing things. Maybe he has to prove himself in their combat trials.
Zeref is also a favorite. His connection to the overall story of Fairy Tail and his role in the events related to the Alvarez Empire offer a lot of room for creativity. Writers can explore his complex relationship with other characters like Natsu and how it impacts the empire - Fairy Tail dynamic.
Typically, Naruto is likely to be a central figure. Alongside him, there could be a noble from the Lyon Empire who is intrigued by Naruto's powers and tries to learn from him. There may also be a ninja from Naruto's village who accompanies him to the Lyon Empire and has to adapt to the new environment. In some fanfictions, there could be a powerful mage or warrior from the Lyon Empire who challenges Naruto and his ninja ways.
There could be new characters introduced specific to the Eternal Empire. Maybe a powerful emperor or empress who rules the empire and has their own motives and secrets. These new characters would interact with Naruto and the existing cast, creating new dynamics and storylines.
One possible plotline could be that Naruto is somehow corrupted or misled. Maybe he discovers some dark secrets within Konoha that he believes can only be resolved by its destruction. As for the Alvarez Empire, they might see an opportunity to expand their influence in the chaos Naruto creates and form an uneasy alliance with him at first.
The Hokage, whoever it is at the time, would see Naruto's actions as a major threat. They would likely assemble the ninja forces to defend Konoha. But there would also be a part of them that would wonder what drove Naruto to this. Kakashi, for example, would be conflicted. He has a deep bond with Naruto, but he also has a duty to protect Konoha. So he would try to find a way to end this without harming Naruto too much.
Obviously Naruto himself is the central character. His friends like Sasuke could also be important. Sasuke might be Naruto's right - hand man, using his Sharingan abilities to help Naruto in various aspects, such as intelligence - gathering or combat. Sakura could be in charge of the medical aspects of the empire, given her skills as a medical ninja. And Kakashi could serve as an advisor, sharing his wisdom and experience.
It could be some of the well - known characters from 'The Empire' who take on new roles in the context of the Glee club. Maybe Lucious Lyon could be one, bringing his strong - willed and often controlling personality into the club and causing some chaos.
There could be a powerful dark lord as a main character. He might be the one ruling the empire with an iron fist.