I don't know for sure without reading it. But it could be the Space Marines. They are very common main characters in Warhammer 40k stories as they are the defenders of humanity.
Since I don't know the specific 'Salvation short story', it's possible that there is a hero - type character who is on a mission to bring salvation to others. There might also be characters who oppose this quest for salvation, like antagonists who represent the forces that keep people from being saved.
It could be about the themes of salvation within the dark and complex Warhammer 40k universe. Maybe it focuses on a character's journey to find redemption in a world full of chaos and war.
Well, the '40k salvation short story' could be about a hero's journey to save a planet or a group of people in the Warhammer 40k setting. It might involve the use of advanced technology and the facing of great odds. For example, a Space Marine might be on a mission to salvage a colony from the clutches of the Tyranids or some other menacing force. They would have to fight their way through hordes of enemies and use their unique skills and weapons to achieve salvation.
It's hard to say without reading the specific story, but it could be a Chaos Lord who serves Slaanesh. They would be a central figure, leading their followers in the pursuit of Slaanesh - inspired desires.
Another type of main characters could be the leaders of different factions. For instance, the commanders in the Imperial Guard who lead their troops into battle against various enemies. Their leadership skills, strategic thinking and the challenges they face while trying to protect their people are often the focus of the stories.
Another key element could be the conflict. There are internal conflicts within characters as they struggle with their own demons or moral choices. And there are external conflicts, such as battles against alien invaders or heretical forces. These conflicts drive the story forward and are closely related to the concept of salvation as the characters try to overcome them to achieve some form of redemption or salvation.
I'm not sure as I haven't read it. But it could be some space marines, or leaders of different factions.
There's John Connor, who is crucial in leading the fight. Also, Marcus Wright is an important character. He has a complex role as he is somehow connected to the machines yet also sides with the humans in the battle against them. Another character could be Blair Williams, who is part of the resistance and plays her part in the fight for survival.
Since I don't know the specific '40k love story', I can't say for sure who the main characters are. They could be anyone from soldiers to civilians in the 40k universe.
Since I don't know the exact 'k seven story', I can't say for sure. But if it's a typical adventure story, there might be a brave protagonist, maybe a character named K or someone related to the 'seven' aspect.