I'm not entirely sure as I haven't read this specific fanfic. But generally, in Red vs Blue, a 'caboose's wedding' fanfic might be about the character Caboose getting married. It could involve all the crazy antics and unique personalities from the Red vs Blue universe coming together for this big event. Maybe there are some humorous misunderstandings, like the wrong person showing up at the altar or some miscommunication about the wedding arrangements.
In this 'caboose's wedding red vs blue fanfic', Caboose is the central character for obvious reasons. Then, considering the nature of Red vs Blue, characters like Tex might also be involved. Tex has had a complex relationship with the other characters in the series. Also, the leaders of the Red and Blue teams could be main characters. They might be responsible for security during the wedding or for making sure everything goes according to plan in their own bumbling ways.
It's probably the combination of the beloved Caboose character from Red vs Blue and the Freelancer concept. That's a unique blend that can offer new and interesting storylines.
One common theme is the exploration of Caboose's innocence in the context of love. Since Caboose is a rather naive character in the Red vs Blue series, fanfictions often play with this trait when it comes to his romantic relationships. Another theme is the idea of unexpected love. Given the chaotic and often comical nature of the Red vs Blue world, Caboose finding love in unexpected places or with unexpected characters is a popular plot point. Also, the theme of loyalty within love is often present, as Caboose is a very loyal character in the original show.
Most likely, the caboose itself is a main character. Since it's about the caboose's strength, it's going to be central to the story.
Well, it really depends on the size of the fan community. Red vs Blue has a decent following, and if the fanfiction manages to capture the essence of both the Caboose character and the Freelancer concept in an interesting way, it could be fairly popular within that niche. But overall, in the grand scheme of all fanfiction out there, it may not be as well - known as some of the more mass - market ones.
One popular fanfiction might be 'The Adventures of Caboose and Carolina'. It could focus on their teamwork and how they overcome challenges together in the Red vs Blue universe. Maybe it shows Caboose's innocent yet powerful nature interacting with Carolina's more serious and skilled persona.
Well, one interesting aspect could be the unique character development of the caboose. Maybe it shows how the caboose's strength is portrayed in different scenarios, like in battles or challenges within the 'Red vs Blue' universe.
In this fanfiction, the caboose could get angry if it has a goal or a dream that is constantly being thwarted by the red vs blue conflict. Let's say the caboose wants to bring peace between the two sides but they keep ignoring its efforts. It tries to communicate but they just laugh at it or don't take it seriously. So all these rejections and lack of respect make it angry.
It could be the leader of the red team. Maybe he gives the caboose the toughest and most dangerous tasks without any proper recognition.
Maybe the Caboose could cross over into a world where the rules of combat are completely different. His Red vs Blue training would be put to the test, and he'd have to adapt quickly. For example, instead of using guns, they use magic or some other form of power. The Caboose might initially be confused but then find his own way to contribute.