There's not enough given about the 'arms at rest fanfic' to figure out the main characters. It could be original characters created by the fanfic author, or it could be characters borrowed from a well - known story. Maybe it's about a group of friends and one of them has their arms at rest in a way that starts an interesting chain of events, but this is all just speculation without more context.
I'm not entirely sure as 'at arms rest fanfic' could be about many things. It might be a fan - created story related to a military or combat - themed work where the characters are at rest from their arms (weapons).
I'm not sure specifically as 'arms at rest fanfic' could be about many things. It might be a fan - created story related to a particular work where a character has their arms at rest in a significant way. Maybe it's about the state of a character's body language in a specific scene and how it affects the story or other characters.
The main characters are obviously Anna and Elsa. Anna is the more outgoing and adventurous sister, while Elsa has her powerful ice - magic. Their relationship forms the core of the fanfic, especially when they lock arms which symbolizes their connection.
There are three main characters in 'Arms and the Man'. First, there's Raina. She is a Bulgarian lady who starts with a rather romantic view of war and love. Then there's Sergius, her fiancé. He is known as a great war hero, but as the story goes on, we see that his heroism has some flaws. Lastly, there's Bluntschli. He is a Swiss mercenary. He is very practical about war, not believing in the grandeur and heroism that Sergius represents. His presence changes the relationships and the views of the other two characters.
One of the main characters is Raina. She is a young Bulgarian woman. Another important character is Bluntschli, a Swiss mercenary. They play significant roles in the story.
The main character is Frederic Henry. He is an American ambulance driver in the Italian army during World War I.
In 'arms and the man story', there are likely to be soldiers as main characters. These soldiers would be the ones engaged in the war that the story is centered around. There may also be civilians who are affected by the war, like family members of the soldiers. And there could be some sort of authority figures, like military commanders. The story might also feature characters who are involved in the romantic sub - plots, which are often intertwined with the war narrative.
There's no way to tell without more details about the story. If it's a military - themed story about an arms race, the main characters might be military leaders or politicians making decisions about weapon development. But if it's a game - based story, it could be the avatars or players within the game world.
In many 'A Call to Arms' - type short stories, the main character is often someone who has a strong sense of justice or a deep - seated need to protect something. It could be a young person full of idealism who sees the wrongs in their society and decides to take action. There might also be an older, wiser character who provides guidance. And then there could be the 'ordinary' people who are initially hesitant but are eventually inspired by the lead character to join the call to arms. Without reading the specific story, it's all speculation, but these are common archetypes in such tales.
I'm not sure who the main characters are as I haven't read it. But they could be soldiers or warriors of some sort given the 'brothers in arms' title.