- the running-gag speculation over the significance of Rex Lapis's taste in perfumes
Speaking of that, someone made a lore post about Guizhong, someone who Rex Lapis was best friends with back in the day before she died. She's the Goddess of Dust that was alluded to in Treasure Lost, Treasure Found and I'll let you read the post instead of repeating things here. I'm 95% positive that the reason Rex Lapis likes perfume for older women is cause it reminds him of Guizhong but I might be wrong.
You should also check out that person's theory/lore posts on Xiao and Venti as well. The Xiao one really squeezed my heart in its hands and spit in my face though, like damn I want Xiao 10x more after reading through it.
Also, wanna bet Ganyu and that weirdo who wears medicine ingredients around his neckpharmacy guy with his snek will be made playable characters somewhere down the road?
Ganyu is confirmed to be one of the two rate ups for patch 1.2 through the leaks. Her and Albedo, a Geo sword user, will be coming. Ganyu herself is a cryo archer with somewhat similar skills to Amber. Like she also has a taunt and a sword rain but it looks like her sword rain is a continuous effect and she has an extra charge to her charged attack that does bonus damage.