I don't know for sure, but I would guess there's the emperor himself. There might also be some sort of resistance fighters or advisors who play important roles.
Since I'm not familiar with the 'emperor doom graphic novel', we can only speculate. The main character is probably the emperor. There could be a love interest for the emperor, who might either be a part of his downfall or try to save him. There may also be some sort of mentor - like figure who has influenced the emperor's actions and is now involved in the events related to his doom. Additionally, there could be commoners or peasants who rise up against the emperor, and they could be important characters as well.
I don't know the exact main characters as I haven't read it. But they could be survivors in a doomed world, like a tough - as - nails warrior, a clever scientist, or a street - smart kid.
I don't know who the main characters in the 'doom town graphic novel' are since I haven't had the chance to read it.
The most obvious main character is Dr Doom himself. He is a central figure, driving much of the action and conflict in the story.
Robotman is a main character. He was once a human but now exists as a sentient robot. His struggle to hold on to his humanity is a central part of his character.
The main characters in the 'doom war graphic novel' are a mystery without having read it. However, based on the title, they could be those directly involved in the war. Maybe there's a protagonist who starts as an ordinary person but is thrust into the chaos of the doom war and has to rise to the occasion. There could also be antagonists who are driving the forces of doom, like a powerful dictator or a malevolent alien race if it's a science - fiction - inspired graphic novel.
Since I haven't read it, I can't say for sure. But it could be a group of survivors trying to make it in the doom towns.
There could be characters like Reed Richards. He is often in conflict with Doctor Doom. Richards represents the scientific and heroic side, which contrasts with Doom's more megalomaniac tendencies.
Dr Doom is, of course, the main character in 'Dr Doom Graphic Novels'. He is a complex villain with a tragic backstory that often drives his actions. The Fantastic Four also often appear as they are his long - time enemies. Their interactions with Dr Doom are a major part of many of these graphic novels.
The main character in 'Sword of Doom novel' is Ryunosuke. He is a complex figure driven by his own dark desires.
I'm not entirely sure who all the main characters are specifically. But there's usually a character who is the wielder or seeker of the sword of doom.