One characteristic is the exploration of their contrasting personalities. Marcus is often more serious while Wrench is quite wild. Fanfics play on this contrast to create interesting interactions.
Well, one common theme is trust. They have to learn to trust each other in many stories. Also, the theme of redemption can be found. Maybe one of them has made mistakes in the past and the other helps them redeem themselves. And of course, there's the theme of adventure. They go on all sorts of exciting missions in a lot of the fanfictions.
One common theme is adventure. Wrench often gets into exciting situations, and the reader is drawn into them. Another is the theme of trust - building. Since Wrench can be a bit of an enigma, the story often focuses on how the reader comes to trust him.
One common theme could be friendship. Since they are likely characters in some context, their relationship might be explored in terms of how they support each other as friends.
There's a fanfic called 'Marcus and Wrench: A New Alliance'. In this one, they start off as adversaries but circumstances force them to work together. It shows their growth and how they come to respect each other over time. It's really engaging as it explores their backstories as well.
One great place to find wrench x marcus fanfiction is Archive of Our Own (AO3). There are various stories there with different themes and plotlines. Some might focus on their adventures together in a post - apocalyptic world, while others could explore a more emotional relationship between them.
There's a fanfic called 'Wrench's Secret'. In this, the reader gets involved in Wrench's world in a very interesting way. It delves deep into his character and how he would interact with the reader on a personal level. There are elements of mystery and adventure that make it a great read.
I'm not sure which specific 'wrench x marcus fanfic' stories are available. You could try searching on fanfiction platforms like Archive of Our Own. They usually have a wide range of fan - created stories.
The uniqueness of 'a wrench in the machine fanfic' might lie in its plot twists. It could introduce unexpected elements into the story, like a character or event that completely changes the course of the narrative.