Honestly, I'm a little burnt out on the mentor/mentee dynamic being the go-to for these two. It feels too surface-level most of the time, like people just slotting them into pre-existing molds. The tropes I find myself clicking on lately are the ones that play with the alchemy angle in a weird, almost cosmic horror way. Albedo's a homunculus, and Klee's got this chaotic, elemental magic—what if his research into her bombs uncovers something about the nature of Teyvat itself that he wasn't meant to see? It's less about romance and more about this unnerving, shared discovery that ties them together in a way nobody else can understand. Those fics have a creeping dread that's way more compelling than another fluffy 'Albedo babysits Klee' story.
That said, the 'Found Family' trope executed well can still hit. I'm talking about the slow, awkward progression where Albedo, who barely gets human emotions, starts recognizing Klee's safety as a non-negotiable priority, not out of duty to Jean but because her absence would create a... logical inconsistency in his world model. He doesn't 'love' her like a brother, not in a sappy way, but her well-being becomes an axiom in his personal code. The fanart of him silently adding blast-resistant padding to her backpack says more than a thousand words of dialogue.