I stumbled into this ship by accident when I was deep in a 'Lion King II' rabbit hole years ago, and the dynamic just got stuck in my head. The most common trope I see is the 'enemies/rivals to reluctant allies to lovers' arc. It writes itself, honestly. You've got the built-in tension of their family history—Vitani trying to prove herself to a legacy that includes Kion, Kion dealing with the fact that his sister’s rival guard is, well, shockingly competent and maybe not so different from him. A lot of fics lean into the 'Heir of the Pride Lands' idea, exploring what it means for Kion to shoulder that responsibility alongside someone who was literally raised to challenge it. I’ve also noticed a ton of cross-generational fics that aren’t strictly about them, but where they’re the stable, slightly weary parental figures for Kopa or Kiara’s cubs, which is a fun angle.
Beyond that, there’s a specific niche of 'Guard Swap' AUs that pop up a lot. What if Vitani had been part of the Lion Guard from the start? What if Kion had spent more time in the Outlands? These stories often dig into nature vs. nurture themes, which fits the original material perfectly. You also get a fair number of 'injury/comfort' plots, where one of them gets hurt protecting the other, forcing a vulnerability they’d normally avoid. It’ became a bit repetitive for a while, but the good ones use it to show how their communication styles differ—Kion being more openly emotional, Vitani showing care through practical actions and gruff concern. The ship thrives on that contrast. Honestly, my favorite fics are the quieter ones that just let them patrol the borders together, bickering about protocol before realizing they’re basically on the same page about everything that matters.