I'm not sure specifically as there could be many novels with this title. However, generally, there might be a protagonist who is at the center of the 'descent into hell' experience. This could be a flawed character, perhaps someone who has made a mistake or is being forced into a difficult situation.
The main theme could be about the struggle between good and evil. In many novels with such a title, characters often face internal or external forces that seem to drag them into a metaphorical 'hell', which can represent moral decay, difficult situations, or a descent into the darker aspects of human nature.
There could be a variety of characters. Maybe a young and brave protagonist who is on a quest and the descent of the phoenix is a crucial part of their journey. There might also be some wise old mentors in the story who know about the phoenix and can guide the other characters. And perhaps there are some side characters like villagers or other magical creatures that are affected by the phoenix's descent and play important roles in different ways in the overall plot.
Since I haven't read 'Descent of the Phoenix Light Novel', I can't accurately name the main characters. However, in most light novels, there are usually a protagonist who drives the story forward, and often some supporting characters like friends, mentors, or rivals that interact with the main character and shape the plot.
I'm not sure who the main characters are in this specific novel as I haven't read it. But it could feature classic Star Trek characters like Captain Kirk, Spock, and McCoy if it's set in the original series era.
I don't know for sure, but there might be the God of Magic as the central character.
I don't really know as I haven't read it. But there should be the demon god himself as one of the main characters.
There could also be a mentor - like character. Someone who has either been through a similar experience before or has some special knowledge that can help the protagonist in their journey through hell and back. For example, an old wise man or woman who gives crucial advice at key moments.
Since I haven't delved into the 'hoarding in hell novel', it's hard to say for sure. However, it's likely that there is a central character who has the hoarding trait. There may be some sort of guide or mentor figure, perhaps an otherworldly being who tries to influence the hoarder's actions. And of course, there could be enemies in the form of hellish creatures that oppose the hoarder's activities or try to take advantage of their hoarded items.
I don't know for sure as I haven't read it. It could be a group of outcasts or people with troubled pasts.
It's possible that the main character is a fallen angel or a damned soul. There could also be otherworldly beings like demons or spirits that play important roles in the story. Without reading the graphic novel, it's all speculation, but these types of characters are common in stories about hell.