User blog comment:Sarnik/Floor Guardians Behavior/@comment-26501532-20150802050230

Well, given that the NPCs can remember the times when they are in games such as the group raid of more than 1200, they said they remember themselves being killed by the players. Mare and Aura thinks that it is a scary moment that time. And Shalltear saying that she remembers some of the talks between the supreme beings such as what is being a voice actor.

I was actually interested to see the NPCs talking about them overhearing some talks between Ainz and the other guild members such as Peroroncino.

Also, in volume 8, there are actually talks among the homunculus maids about their thoughts of Ainz, some think that he is the smartest, while some think that he is the strongest and fitting of death, some think that he the most beautiful and some think that he is generous, to the point that the maids are arguing with each other about which is most fitting about Ainz.

Though it is not said a lot in the volume about what the NPCs feels about their creators leaving them but they felt lonely and still shows their love for their creators such as Aura being really happy about Ainz giving her the watch with  Bubble Bubble Teapot's voice, Shalltear still claiming that  Peroroncino is greater than Ainz, Demiurge feeling reluctant about giving away the statue Armageddon·evil which is made by Ulbert, so Ainz give Demiurge another statue made by Ulbert, which made Demiurge really happy.

Also seems during that in the game, the NPCs just blindly follow orders like robots, so in the real world, a lot of the NPCs too, as Ainz said, continue to follow orders blindly like a robot.