They come from a different planet than other elves? Like the other elves come from the planet Arvandor. They have dark skin. Males have red (cool mauve) skin, and females have blue (night blue) skin. Hair color can range from stark white, to light blue, light purple, and light green.
I named the original drow planet Avalonea. They are also polyamorous, and typically have more than one mate. Some drow are monogamous -- but they are the exception, not the rule.
Here's the article I wrote on their society:
https://www.worldanvil.com/w/the-orcs-of-kara-kar-eltonj/a/drow-society-ethnicity
Here's the article I wrote on their origins:
https://www.worldanvil.com/w/the-orcs-of-kara-kar-eltonj/a/the-way-of-the-spider-myth
The idea is not an evil race.