One great 'Transformers Watching The Last Knight' fanfiction is 'Cybernetic Observations'. It delves into the Transformers' unique perspectives while watching the events of the movie. The author does a wonderful job of showing how they might react to the human - Transformer interactions and the battles that unfold.
There's a fanfiction that focuses on Optimus Prime's thoughts as he watches the events of 'The Last Knight'. It shows his internal struggle with the revelations in the movie, his loyalty to his comrades, and his view of the humans involved. It's a deep and engaging piece that really adds to the understanding of the character within the context of the movie.
In 'Transformers Watching The Last Knight' fanfiction, the 'time - travel' trope can be found in some stories. This allows the Transformers to go back and change or better understand the events of the movie. The 'what - if' trope is also popular. For instance, what if a different Transformer was in charge during the events of the movie? And the 'secret - revealed' trope, where hidden secrets about the Transformers or the movie's plot are uncovered as they watch the movie.
First, do a lot of research on the Transformers universe, especially the lore and characters in The Last Knight. Know the rules, like how the Transformers function, their relationships, and the overall plot of the movie. Then, develop your OC. Give them a clear personality, backstory, and motivation. For example, if your OC is a human helping the Autobots, why are they doing it? Are they in it for adventure, or do they have a personal vendetta against the Decepticons? Next, create a solid plot that involves your OC in a meaningful way. Don't just have them tag along. They should contribute to the story. Also, pay attention to the dialogue. Make it sound natural for both the humans and the Transformers. And finally, proofread your fanfiction carefully to avoid any grammar or spelling mistakes.
Megatron and a powerful, perhaps morally ambiguous character from 'The Last Knight'. Megatron's thirst for power and the other character's own desires could either lead to a clash or an unexpected alliance. It would be fascinating to see how their different motives play out and whether they end up working towards a common goal or against each other.
The plot involves the Autobots and Decepticons' ongoing struggle. It might include their battles on Earth and in space, with Optimus Prime playing a central role in the fight for the future of their race and the planet Earth.
One idea could be to focus on the interaction between the Autobots and the characters from 'The Last Knight' universe. For example, how would Optimus Prime react to the ancient secrets and magic in that world? Another inspiration could be the concept of transformation in both. The Transformers can transform physically, while in 'The Last Knight' there might be metaphorical or magical 'transformations' of characters. You could explore how these different forms of transformation intersect.
One idea could be an OC who is a mechanic with a special ability to understand ancient Cybertronian technology. This character could be found by the Autobots and end up helping them repair an important artifact. They might have a backstory of being an outcast in their human community because of their obsession with machines, but in the Transformers world, their skills are highly valued.
There's also 'The Resistance Rebuilds'. This fanfiction looks at how the Resistance could have rebuilt faster and more effectively after the events of 'The Last Jedi'. It's interesting as it gives more agency to the side characters and shows a different take on the overall story arc of the Star Wars universe post - 'The Last Jedi'.
Optimus Prime is surely one of the main characters. He's the leader of the Autobots and a key figure in the story.
One great Transformers time travel fanfiction is 'Back to the Beginning'. It takes the Autobots and Decepticons back in time to the early days of Cybertron. The author does a great job of exploring how the characters' knowledge of the future affects their actions in the past.
One interesting female Starscream fanfiction could be one where she is leading her own faction within the Transformers universe. In this story, she might use her cunning and strategic mind to outwit her male counterparts. It could explore her character in a new light, showing her as a strong and independent leader, rather than just a secondary character.