Honestly, I see a lot of fanfics treat the time skip as the main event, and they kind of miss the point. Everyone wants to write the 'Eris returns' moment, which is fine, but the best stories I've read dig into the real evolution, which is way messier. They'll start with canon Rudeus—that broken, traumatized kid who can't read a social cue to save his life—and Eris, all raw power and zero emotional vocabulary. The fics that resonate show them learning a shared language that isn't words. It's in how a writer will have Rudeus, post-Paul's death, flinch at a sudden movement, and Eris doesn't get angry; she just stops moving, waits. That subtlety is everything.
Then there's the divergence stuff, which is where fanfiction really shines. I've seen a popular trope where Rudeus never gets his ED cured, and the relationship becomes this intense, non-sexual partnership built on pure loyalty and battle synergy. It's a different kind of intimacy, and it forces them to communicate in ways canon didn't explore. Another angle is having Eris return earlier, before the despair hits rock bottom. That changes the power dynamic completely—she's not returning to a depressed husk but to someone still fighting, and her arrival becomes a reinforcement instead of a rescue. It feels less like a fairy-tale ending and more like two soldiers finally reuniting.
What I'm tired of, though, is when writers just rehash the jealousy plots with Sylphie or Roxy. That feels like cheap drama. The real evolution in good fanfiction isn't about adding more love triangles; it's about deepening the unique damage they share. They're both survivors of the Displacement Incident, both carrying guilt for things beyond their control. The best fics weave that shared trauma into the fabric of their bond, making their eventual partnership less about romance and more about two deeply flawed people choosing to build something stable in a world that threw them into chaos. It's less 'will they/won't they' and more 'how do they possibly make this work,' which is infinitely more interesting to me.