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.
Without more details about the 'doom book story', it's difficult to determine the main characters. However, it might feature a brave hero or heroine who stumbles upon the doom - related events through the book. There could also be a shadowy figure, perhaps a sorcerer or a malevolent force, that is behind the doom that the story is about.
The main character is the Doom Marine. He is the one who battles the demons throughout the story.
The primary character is a space marine. He's a tough and fearless fighter. There may also be some supporting characters like scientists or other military personnel in the base who might get involved in the events, but the space marine is the central figure in the doom base story.
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.
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.
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 specifically since I haven't read it. But it could have a heroic protagonist who is the doom breaker. There might also be a sidekick or mentor character to help the main character on their journey.
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.