I'm not sure about the main characters in this 'the day of wrath story' as there's not enough information. But if it's a story about a community facing wrath, the main characters could be the leaders of that community who have to deal with the situation, or it could be the ones who have caused the wrath in the first place.
Since I don't know the specific 'the day of wrath story', it's difficult to determine the main characters. It could be Gods or deities if it's a religious story about divine wrath.
There could also be an antagonist. This character might be the cause of the 'day of wrath' or someone who tries to take advantage of the chaos that the day brings. For example, if the day of wrath is brought about by some sort of social upheaval, the antagonist could be a power - hungry figure who wants to gain more control during the turmoil.
Typically, in a 'the wrath of man story', the central character is, of course, the man in a state of wrath. He could be a regular guy who has been wronged in some way. There may also be supporting characters. For example, a friend who tries to calm him down or a mentor who gives him advice. And then there could be the antagonists, the ones who have made him angry in the first place. They might be powerful figures or just ordinary people with bad intentions.
Not having read the 'angel of wrath novel', we can only speculate. The main character is probably the angel of wrath itself. There may be side characters such as those who are the targets of the angel's wrath, for example, sinners in a religious - inspired setting or enemies in a more general fantasy setting. There could also be other angels or spiritual beings that play important roles, either trying to temper the wrath of the main angel or being drawn into its actions.
Another possible theme is chaos. The 'day of wrath' might bring about chaos in the story. People's lives could be turned upside down, relationships broken, and normalcy disrupted. This chaos then serves as a backdrop for the characters to either succumb to or rise above the difficult situation.
Since I don't have specific knowledge of this exact 'wrath a seven deadly sins story', in a general sense, there might be a central character who is either consumed by wrath or trying to overcome it. There could also be supporting characters like a mentor figure who tries to guide the wrath - filled character, or an antagonist who provokes the wrath. There may be other characters who are victims of the wrath - driven actions in the story.
Arthas is a main character as he is the Lich King. Tirion Fordring also plays a significant role. And there are other heroes from the Alliance and Horde like Jaina Proudmoore.
There are two key characters in 'the wrath and the dawn graphic novel'. One is the young woman who bravely steps into the marriage with the king. She's intelligent and strong - willed. The other main character is the king. He has a dark and mysterious side, with his actions of killing his brides being a central part of the mystery in the story. There may be other supporting characters as well, but these two are the most important ones that drive the plot forward.
Since it's a fanfiction based on Naruto, it might focus on the main protagonists like Naruto, Sakura, and Kakashi. Naruto could be the main character dealing with the sin of wrath, perhaps due to some new threat or a personal struggle. Sakura might be involved as she has her own growth in the series and could be a support or a contrast to Naruto's wrath. Kakashi, with his own past traumas, could also play a role in either guiding Naruto away from wrath or understanding it better.
Well, without more specific information, it's hard to say exactly. It could be a fictional story where a particular day is filled with wrath. Maybe it's a day when a character or a group of characters face the consequences of their wrongdoings. It could also be related to a natural disaster that occurs suddenly and is seen as an act of wrath from nature or some higher power.
It's hard to say for sure without reading it, but it could be Naruto as the main character who somehow gets involved with the Dragon Sin of Wrath. Maybe Sasuke could also be a key character, either as an ally or an antagonist depending on how the story goes.