There's a fanfiction called 'Grimlock and the Lost City'. It takes Grimlock on an exploration to find a lost Cybertronian city. Along the way, he has to face various challenges and enemies. The story does a great job of portraying Grimlock's brute strength as well as his hidden intelligence.
One interesting female Decepticon fanfic could be about a female Decepticon's journey to find her true place within the Decepticon ranks. It might explore her relationships with other Decepticons, both positive and negative.
A fanfiction could revolve around the idea that there is a prophecy involving Bumblebee, Grimlock and this mysterious X. Bumblebee is seen as the key to finding X, and Grimlock is tasked with protecting Bumblebee. Along the way, they face many challenges. Grimlock's dinosaur form might get them out of some tough situations by brute force, while Bumblebee uses his intelligence to solve puzzles. As they get closer to finding X, they learn that X is not what they expected and it has the potential to change the fate of all Transformers.
To write a great Transformers Grimlock fanfiction, focus on his relationships. Show how he interacts with the other Autobots, like his loyalty to Optimus Prime despite their differences. You can also introduce new characters that challenge or befriend Grimlock. And don't forget about the action. Describe his battles in detail, how he uses his strength and his sword to fight off the Decepticons.
One idea could be a crossover with a modern military setting. The Decepticons could be trying to steal advanced military technology. Another is a crossover with a post - apocalyptic world where they are competing with other factions for resources. A third could be a crossover with a magical realm, with the Decepticons trying to harness the magic for their own evil purposes.
One common theme is redemption. Many fanfictions explore the idea of a Decepticon OC trying to break free from the evil ways of the Decepticon faction and find a new path. For example, an OC might realize the destruction they've caused and seek to make amends.
One possible storyline could be that after years of war, an Autobot and a Decepticon realize the futility of their fight. They secretly meet and start to communicate. They find that they both have similar desires for their home planet, Cybertron. So they decide to work together to bring about peace, facing opposition from both their factions.
A common theme is the clash of two different worlds. The magical world of Harry Potter and the technological, war - based world of the Decepticons are so different that when they meet, there's bound to be conflict. Another theme is the idea of power. Both universes have their own forms of power, magic in Harry Potter and advanced weaponry in the Decepticons. Writers often explore how these powers interact and which is more dominant.
In a Transformers Prime fanfiction, a human could befriend a Decepticon who is disillusioned with the evil ways of their faction. Together, they try to find a way to bring peace between the Autobots and Decepticons. This would involve many challenges as both sides are distrustful of the other. The human's unique perspective might be the key to making it all work.
I'm not entirely sure which specific 'Grimlock x Fem Human Lemon Fanfiction' you are referring to. But generally, such a story might explore an unusual relationship between a non - human character like Grimlock and a female human. It could involve themes of inter - species understanding, adventure, and perhaps a touch of romance. However, without reading the specific fic, it's hard to give a more detailed analysis.