Who are the main characters in 'the sword of doom novel'?

I don't know as I haven't read the 'doom breaker novel'. It could be a lone hero or a group of diverse individuals.

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.

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'm not familiar with the 'Mortals of the Doom Light Novel', we can only speculate. There could be a main character who is a fighter, always on the front line against the elements of doom. There might be a healer type character as well, someone who tries to mend the wounds of the mortals both physically and emotionally. And perhaps there is a character with a mysterious past that holds the key to either the cause of the doom or the solution to it.

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.

I'm not sure about all the main characters specifically. But often in such novels, there is a central protagonist who is likely to be the one facing the challenges of the doom world. There may also be some side characters who play important roles in the protagonist's journey, like a mentor or a friend.

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.

The main character is the Doom Marine. He is the one who battles the demons throughout the story.

Since I don't know the exact 'doom book story', I can't say for sure. But it could have a protagonist who is trying to stop the doom, and maybe an antagonist who is causing the doom.