By anonymous NPC, I mean the NPCs not quite important enough to actually have a name and have little to no unique dialog, but all the same, they're memorable because there actually aren't any random non-hostile NPCs in New Vegas, so every NPC has the same face and mannerism every time.
A lot of NPCs come to mind for me.
The farmers of Goodsprings (one of which is actually Jerry McGhoulBerry in AlChestBreach's mod reviews)
The guy at the barstool in Goodsprings with the hat.
A random NCR trooper in Camp Golf who can be talked to but has no dialog.
The Vagrant (ironically has a unique title but is of no importance whatsoever)
The King's messenger who just LOVES giving you stuff
A female prospector with long hair found near the Helios ONE's side exit of Scorpion Gulch, often found dead.
I just find it kind of cool that random NPCs with seemingly no personality whatsoever can develop a personality just by being recognized doing the same thing in each playthrough.
So what random NPCs do you actually remember or have in some way developed a personality for you?
Inb4 Mick and Ralph's Crier