Around the San D'Orian embassy in Windurst (OMG EMBASSIES should be added if we "like each other so much") there was a roaming mithra that just walked around. It seemed weird if you sat there for a while and watched her, but if you were zooming in and out it was nice to be like "ahhh that crazy mithra", made it feel like there were other people in the city than you, and the other people in the city didn't just stand all day long. The closest thing we have to this is the Guilds where npcs do guild tasks.