You can't talk about this without acknowledging that a ton of the early fics in this vein were pure smut framed around 'opposites attract'—like, literally sparking against each other. It was surface-level stuff. But I've seen a shift over the years, where writers actually dig into the elemental clash as a metaphor for personality. A Flareon's fire isn't just aggression; it's warmth, stubbornness, a slow-burning protectiveness. Jolteon's electricity becomes nerves, anxiety, a quick-to-react sharpness. The good stories aren't about who wins in a fight; they're about how these energies balance or destabilize a relationship.
One of my favorite fics had a Jolteon character constantly overthinking, buzzing with static that kept others at a distance, while the Flareon was this grounding, solid presence whose simmering anger only flared when the Jolteon's self-doubt went critical. The 'contrasting traits' became a way to talk about communication styles—slow, deliberate heat versus rapid, chaotic sparks. It’s surprisingly easy to map onto neurodivergent-coded characters or just different conflict-resolution methods, which adds a layer of depth the original games never touched.