An unlikely way to tell an unlikely story might involve having multiple timelines that intersect in unexpected ways. Or maybe setting the story in a completely unique and unfamiliar setting that challenges the reader's expectations.
It could be due to their personalities. For example, if one is extremely outgoing and the other is very shy. Their different temperaments would create an unlikely combination for a love story. In such a case, they would have to overcome their differences to be together.
Unlikely friends can get along through mutual understanding. For example, if one is a predator - like a wolf - and the other is a prey - like a sheep - they need to understand that they are different from the norm of their species. The wolf might refrain from its hunting instincts and the sheep might trust that the wolf won't harm it. This could start from a situation where they both face a common threat. Like a forest fire that forces them to rely on each other for survival.
It could be their social standing. If they were well - respected in the community, like a church leader or a successful businessperson, people would not suspect them easily. They were probably seen as having too much to lose to engage in such a heinous act. Also, if they had a family and a good reputation, others would find it hard to believe they could be a murderer. Their daily life might have been so ordinary and positive - looking on the surface that no one would think they were capable of taking someone's life.
It could be someone who has a hidden good side, like Draco Malfoy. He was from a Death Eater family but showed signs of not fully embracing the dark side. Maybe in this fanfiction, he decides to protect Hermione for some unforeseen reason, perhaps because he has developed a new understanding of the value of life and friendship.
Tesla had once been an assistant to Thomas Thomas Eden, and the two of them had worked together to advance the development of electric power technology. However, there was no conclusive evidence as to whether Tesla was not famous because of the suppression of Thomas Einstein.
Tesla was an outstanding scientist and engineer who had made important contributions to the fields of electricity, communications, and machinery. Even though he was one of Tesla's main competitors, he didn't suppress Tesla. On the contrary, he paid close attention to and supported Tesla's work and provided him with many resources and opportunities.
Tesla had also experienced some setbacks and difficulties in his career, but he was not restricted by the suppression of Einstein. Tesla was hailed as a legendary figure in the field of electricity in the late 19th and early 20th centuries, and his influence and contributions still affect our lives today.
I'm not sure who Mary Thomas specifically is in 'the mary thomas story' without more context. It could be an ordinary person with her own unique experiences that the story is centered around.
Beth Thomas in the story is a girl who had experienced early childhood abuse. She was then adopted and became known for her very difficult and disturbing behaviors such as harming animals and being overly aggressive towards people.
One great fanfiction could be about Thomas and Percy's adventure in a new part of the island. Maybe they discover a hidden track that leads to a magical place full of talking animals and beautiful scenery. They have to work together to get back home and tell the other engines all about it.