As I said before, if it's DmC: Devil May Cry, Nero is a main character. Dante is also an important character in this game's story. There are also characters like Vergil who play significant roles in the overall plot.
I don't know the main characters in the 'nero days story' without more information.
The main characters in the 'nero days end story' might be a group of individuals who are directly affected by the events leading to the end of these 'nero days'. It could be a young protagonist who discovers the truth about the 'nero days' and tries to change the course of events, along with his or her friends or family members who support or oppose the protagonist's actions.
If it's the game 'DmC: Devil May Cry' where Nero is a main character, the story is about Nero, a young demon hunter. He lives in a world where demons from the underworld are constantly trying to invade the human world. Nero has a special arm called the Devil Bringer which gives him unique powers to fight demons. Along with Dante and other allies, he battles against powerful demon lords to protect humanity and also discovers more about his own past and his connection to the demons.
The main character is Nero Wolfe, a brilliant and eccentric detective. He is overweight and loves his food and orchids. He rarely leaves his brownstone house but can solve the most complex cases through his brilliant mind.
Well, obviously Nero and Sparda are the main characters. Nero, with his white hair and his Devil Bringer arm, is a key figure in the Devil May Cry series. He's known for his brashness and his strong sense of justice. Sparda, on the other hand, is a legendary demon. He's the father of Dante and Vergil. He's a very powerful and mysterious character. In this fanfiction, their encounter would be the central focus, and their different personalities and powers would drive the story forward.
Sometimes, there could be historical characters as main characters too. For instance, if Nero travels back to the Roman Empire, Caesar or Cleopatra could be important characters. They would interact with Nero, and their different personalities and goals would create interesting storylines. Nero might have to work with them or against them depending on the plot.
In these fanfictions, V is often depicted as a complex character. He might be mysterious, with his own motives for protecting Nero. Nero, on the other hand, is usually portrayed as a strong and somewhat naive character who may not always be aware of the extent of the danger around him until V steps in.
Since I don't have more information about the 'nero days story', it could potentially be a historical narrative centered around someone named Nero. It could tell about his rise to power, his rule, and the events that occurred during his days. It might also be a creative story that just uses the name Nero in a completely fictional and unique context, perhaps in a fantasy or science - fiction setting where Nero has some special abilities or a significant role to play.
He could meet historical figures like Julius Caesar. Nero might have a conversation with him and learn about ancient Roman politics.
Since I don't know the exact 'arx game story', I can't say for sure who the main characters are. It could be a lone adventurer or a group of heroes.