Maybe they get separated in a strange dimension. Rex tries desperately to find Mythra while she has to fight her own battles in that dimension. In the process, they both grow as individuals and when they are reunited, their bond is even stronger. They could then go on to face new challenges together with their strengthened relationship.
One idea could be that Mythra and Rex have to team up to save their world from a new, powerful enemy. During their journey, they discover new powers within themselves and also realize their feelings for each other are deeper than they thought.
A plot could revolve around a mysterious curse that affects Mythra. Rex, being the determined person he is, sets out to find a cure. Along the way, they encounter various allies and enemies. As Rex gets closer to finding the cure, they face many trials that test their relationship. In the end, Rex's love and determination break the curse and they celebrate their victory and newfound closeness.
Maybe a fanfic where Rex discovers a hidden talent of Breach that no one else knew about. For example, Breach is an amazing artist but has been hiding it. Rex encourages Breach to show it to the world, and through this process, their relationship blossoms. It could also involve some challenges from the other members who don't believe in Breach's new - found confidence.
Their relationship can be developed through shared adventures. For example, going on quests where they rely on each other's skills. Rex might need Mythra's combat abilities and Mythra could need Rex's determination and kindness.
The combination of two very different universes. Naruto is from a world of ninjas, with chakra and unique jutsu. Mythra is from a high - tech fantasy world in Xenoblade. When you put them together, it creates a lot of potential for unique stories. Writers can explore how their powers interact, like Naruto's shadow clones and Mythra's blade skills.
Perhaps a post - apocalyptic world where an Indominus Rex and a group of humans form an unlikely alliance. The Indominus Rex, being a powerful predator, helps the humans fend off other dangerous dinosaurs in exchange for food and shelter. The story could explore the trust and fear dynamics between the two species.
One idea could be a time - travel scenario where a human goes back in time and has to interact with a T - Rex. Maybe the human has to find a way to communicate with it to prevent some sort of prehistoric disaster. Another could be a story where a T - Rex is brought to the modern world through some scientific experiment gone wrong, and a human befriends it and tries to protect it from those who want to harm it. A third plot could involve a world where dinosaurs and humans coexist, and a human and a T - Rex form an unlikely alliance against a common enemy.
A good Rex x Mythra fanfiction often focuses on their relationship development. For example, showing how they gradually understand and trust each other more.
One plot idea could be that Rex's nanites start to interact strangely with the eezo in the Mass Effect universe. This causes unforeseen effects like creating new forms of biotics or causing glitches in mass relays. Another idea is that Rex is mistaken for a new species and is studied by Cerberus, who want to use his nanites for their own evil purposes. He has to escape and team up with Shepard to take down Cerberus once and for all.
One great fanfiction could be where Rex and Mythra go on a journey to a hidden land in Alrest. In this story, they might face new and unique enemies, and their relationship could grow stronger as they rely on each other's skills.
One common theme is their relationship. Writers often explore the complex bond between Pyra and Mythra, whether it's sisterly love or something more nuanced. Another theme could be their adventures in the Xenoblade Chronicles world, like facing new enemies or exploring uncharted areas together.
Perhaps Rex travels to a time where dinosaurs and humans co - exist. He has to figure out how this is possible and if it's a threat to the future. Or he could go back to the time of the Renaissance and become an apprentice to a famous artist, using his modern perspective to influence the art world in ways that have a ripple effect through time.