Well, a cool plot for mechagodzilla fanfiction could be that Mechagodzilla is actually a sentient being that has been misunderstood all this time. It starts to communicate with humans through some sort of technological interface. Then, it reveals that it was built by an ancient civilization that disappeared long ago and has its own mission to fulfill that is not necessarily related to destruction. Another idea is that a group of rebels steal Mechagodzilla to use it against a tyrannical government that has been oppressing the people. They have to figure out how to control it and keep it hidden from the authorities at the same time.
One idea could be a story where Mechagodzilla is reprogrammed by a young genius to protect the city instead of causing destruction. Another could be a time - travel fanfic where Mechagodzilla is sent back in time and has to face off against its earlier versions. Or perhaps a fanfic where Mechagodzilla teams up with other kaiju to fight a common, even greater threat.
One idea could be a story where Mechagodzilla is initially built to protect the city from Godzilla, but then they discover a common enemy that forces them to team up. Maybe an alien force arrives that threatens both of them and the planet. So they have to put aside their differences and fight together.
Godzilla is an obvious choice. The dynamic between Mechagodzilla and Godzilla can create intense and exciting stories. Also, Mothra could be included. Her gentle nature could contrast with Mechagodzilla's more mechanical and often aggressive nature. Another character could be King Ghidorah. The three - headed monster could form an alliance or be in direct conflict with Mechagodzilla in a fanfic.
One idea could be exploring the unspoken stories of the ranch hands. Maybe there's a hidden love affair between two of them that has to be kept secret due to the social norms of 1923. Another could be focusing on how a young character dreams of leaving the ranch and going to the big city, but faces many obstacles. And a third idea could be a mystery plot where strange things start happening on the ranch and the characters have to figure out what's going on.
One common theme is the battle between technology (Mechagodzilla) and nature (Mothra). It often explores how these two very different forces interact and conflict.
One interesting plot idea could be exploring how different characters adapt to the post - apocalyptic world in new and unexpected ways. For example, a character who was once a timid office worker becomes a fearless scavenger.
One idea could be exploring a character's backstory more deeply. For example, focusing on Nina's experiences at Stanford and how she really felt being away from home. It could show her internal struggles and how she overcame them.
One idea could be a time - travel plot. A character from the present Windbreaker world somehow travels back in time to the early days of cycling in their town. They meet the predecessors of the current cycling teams and learn about the origin of their beloved sport. Another plot could be a mystery where a valuable cycling part goes missing from a top - notch bike right before a big race. The characters have to solve the mystery and find the part in time to compete. Or, a character could have a secret power related to cycling, like being able to communicate with their bike, and they have to keep it a secret while using it to win races and help their friends.
One idea could be exploring Frank Castle's past relationships more in - depth. Maybe a long - lost love from his pre - Punisher days resurfaces, adding an emotional layer to his character. Another could be a story where he teams up with an unexpected ally, like a young hacker who helps him take down a high - tech criminal organization.
One idea could be exploring an alternate reality where the moon's journey through space leads it to a parallel universe filled with benevolent alien races that offer to help the moonbase inhabitants. Another could be a time - travel plot where the crew of Space 1999 travels back in time to Earth before the moon was blasted out of orbit and tries to prevent the cataclysm that sent them into space. A third idea might be a story focused on the personal relationships of the crew members during a long - term crisis situation on the moonbase.
One idea could be a character's journey through a heatwave - how they struggle with the extreme heat, shortages, and the chaos it brings. Maybe they have to find a way to cool down an entire community or save a loved one affected by heatstroke.