I'm gonna need a second to untangle my thoughts because I've spent so much time knee-deep in 'Voltron: Legendary Defender' fic that everything else seems quaint. The popular pairing for Shiro and Keith is, overwhelmingly, Sheith. It’s the backbone of the fandom. You get this incredible dynamic built on years of loyalty, trauma bonding, and that 'found family' trope that hits different in space.
But the real juice for me is in how writers play with the timeline. You have the classic post-series fix-its where they finally talk, sure. Yet the AUs are where it shines—coffee shop AUs feel overdone, but I’ve seen some fantastic noir or fantasy reimaginings where Keith is a knight and Shiro’s the cursed prince he’s sworn to protect. The power dynamics shift beautifully there.
There’s also a smaller but fascinating niche for pre-Kerberos Shiro/Adam & Keith/Garrison-era Keith, which essentially explores the 'what if Shiro never left' scenario. It’s more about missed connections and bittersweet longing. I tend to browse on AO3 and filter by kudos for the heavy-hitters, then sort by 'date updated' to find the newer, weird stuff that hasn’t hit the mainstream radar yet.
My bookmark folder is a mess of tags like 'canon divergence', 'mutual pining', and 'hurt/comfort', which feels like the holy trinity for this ship.