Probably Narcissus because he was vain about something(his looks) that he didn't actually have control over, whereas Arachne was vain/proud but at least she has the skills to back it up and Niobe was just proud of her ability to have kids.
En África, las personas más ricas y poderosas tenían esclavos para utilizarlos como soldados en las guerras o como una forma de demostrar su poder y su prestigio.