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.
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.
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.
It could be the leader of the red team. Maybe he gives the caboose the toughest and most dangerous tasks without any proper recognition.
In a crossover with a more fantasy - based world, a character like a wise old wizard could be paired with Caboose. The wizard could initially be frustrated by Caboose's lack of understanding of the new world's magic and customs, but over time, they could form an unlikely friendship. Caboose could teach the wizard about loyalty and friendship in his own simple way, while the wizard could teach Caboose some magic tricks.
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.
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.
Well, obviously Naruto would be one of the main characters. Since it's a red vs blue concept, there could be two versions of Naruto representing the red and blue sides respectively.
Some of the main characters include Church, Tucker, and Caboose. Church is often a central figure, known for his sarcastic and sometimes mysterious nature. Tucker is the one with the sword and has his own set of comical adventures. Caboose is the big - hearted but not - so - bright character who often gets into trouble and provides a lot of the humor.
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.