As someone said, the background characters are literal NPC's. I thought it was just some self-aware ironic humor by making them this generic, but no, the author genuinely has a fetish for this setting. Sad I guess
I've gotten impatient and read ahead in the raws, and all I can say is: steel yourself for the slowest of burns. 35 chapters later, they are still learning crucial parts of each other's backstory while tentatively building some mutual trust.