I like the idea of a maid/butler elf, in a non-coomer way. A noble immortal creature that for one reason or another serves humans over multiple generations, be it because it was cast of from their own kingdom in a fantasy setting or is one of those urban elves in a modern fantasy setting that treats a job they're going to do for a decade or two as a temporary side gig.

And then they spend the next century either serving one family and bonding with them, seeing new generations being born and seeing them off before moving on, or one that switches their employers every few years but bonds with other working people.