The dark elves (druchhi) of Warhammer look just like high elves, as they're only a cultural offshoot. With a change of accent, they can easily pose as high elves.
Most of them are of an ethnic group with pale skin and black hair, but some high elves have such coloration, and besides there's makeup and hair dye.
The drucchi generally worship either Caine, an evil elf god (who is not at all like Lolth) or Slaanesh, a Chaos god (who is a bit like Lolth). The rival religions are a major theme in their culture. The emperor worships Khaine but his mother worships Slaanesh, and only at her urgings has he allowed the religion of Slaanesh to survive. A common practice of drucchi is to create pleasure cults devoted to Slaanesh among the high elves. (Since there's no real ethnic difference, you can effectively turn a high elf into a drucchi that way.)
Despite not having drow-like abilities, I think they're still pretty similar to drow. Their history is similar but with less time (there are drucchi who were literally high elves in their youth). They have a bunch of drow-like traits, such as using crossbows and generally being untrustworthy and murderous. Also, they hate high elves, seemingly far more than drow (who, despite their hatred, only strike when an opportunity presents itself).
What are the most important features of the Drow?
Elf: Drow are a kind of Elf
Fey: Drow have otherworldy origin
Spiders: Drow venerate spiders
Demons: Drow venerate demons
Evil: Drow align with Evil (predatory, no compassion)
Chaotic: Drow align with Chaos (treacherous, no loyalty)
Matriarchy: Females lead each Drow house
Dexterity: Rogue or light-armor Fighter or ambidexterity
Spells: Drow can instinctively cast Darkness and Faerie Fire
These, which is most of the list.
In addition, drow were a strange type of creature when first presented. I had read an
inaccurate battle report of the first meeting of the drow in that adventure I won't name to avoid spoiling.
The PCs knew nothing of drow, and had been fighting some other kind of monster. Now all of a sudden they were showered with poisoned bolts from the darkness, paralyzing some. Then they were set upon by "thieves" using Backstab and chanting priestesses with spell-like abilities such as levitating out of your reach (into the darkness). But inaccurate, as the very first encounter with the drow wasn't a
complete surprise (even though their nature was).
My understanding are those initial drow were lower level than the PCs (who were pretty up there at the time) but still a challenge due to the surprising nature of their attacks, their ability to communicate silently just by blinking their eyes (while PCs had to talk and use light), and the general combined-arms nature of creatures that use classes much like the PCs. Making matters worse, they were hard to target, laughed at spells, and while you could kill them and take their stuff, you couldn't keep it for long. as a D&D designer said of them, "neener neener".
One of these days I'll use these guys. (They were such wimps in 3e... especially their clerics.)
Drow are stealthy and treacherous in combat. They will work together only because it gives an advantage. The moment a drow looks distracted, he's probably getting stabbed by a "comrade". Or maybe he's just trying to provoke a sneak attack so he can claim self defense...
Pretty much every drow is sexy, scheming, and insane. Drow aren't so much smarter than their opponents but so steeped in conspiracy and paranoia that they already have a plan for your inevitable betrayal. Even if said "betrayal" is accidentally stumbling at the dinner table.
Oddly enough, mind flayers share many of their properties. They're also supremely adapted to the dark and can mind control you. It's hard to fool something that can read your mind, and it's hard to adapt to them because they're accompanied by grimlocks (demihumans who are also very well adapted to the dark). Also, they have those ... dietary habits.
For drow, I voted against slaves. I don't know when that became a drow feature; I think it's RAS's work. A typical battle with drow shouldn't involve tangling with a thin screen of goblins first, IMO, but I will admit this is gamist talk. (It makes sense from the drow PoV. I just wonder where they can find all these slaves.)