Often, a theme of coexistence or conflict is present. Since they are so different, they can either find a way to live side by side in the story world or be in constant conflict. Also, the idea of redemption might be there. If Mechagodzilla is initially a force of evil, it could seek redemption through its interactions with Mothra. And there's the theme of the balance of the world. Their actions can tip the balance towards destruction or restoration.
One common theme is the battle between technology (Mechagodzilla) and nature (Mothra). It often explores how these two very different forces interact and conflict.
A Mechagodzilla x Mothra fanfic might explore their different natures. Mechagodzilla, being a man - made weapon of destruction, and Mothra, a symbol of nature and rebirth. The story could be set in a post - apocalyptic world where they have to work together to restore balance. Or perhaps it's a story of how their conflict shakes the very foundation of their world. There could be elements of human interference, like scientists trying to control Mechagodzilla while Mothra tries to protect the natural order.
Another option is to look on social media platforms. There might be groups or pages focused on Godzilla and kaiju fanfiction. People could be sharing their works or know of others who write about Mechagodzilla and Mothra. You can search using relevant hashtags like #Mechagodzilla #Mothra #Fanfiction.
There's also a lesser - known fanfiction called 'The Silent Understanding'. It delves deep into the psychological connection between Rodan and Mothra. It's not action - packed like some others, but it's a very touching story that explores their unspoken feelings for each other in a very subtle and profound way.
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 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.
A common theme is the exploration of their relationship. Whether it's a friendship that develops into something more or a pre - existing bond that is tested.
A common theme is friendship. The human and Mothra often form a deep bond of friendship that helps them face challenges. Another theme is protection. They usually work together to protect the Earth from other threats like other kaiju.