Solitaire

Solitaire and Shadowseer. One wearing latex clothing and the other wearing super-tight leotards. Massive fap material.

The Dudebro counterparts. Channeling Ezio Auditore.

An interesting note on their plays, only a Solitaire (those delicious women off to the side, though men can become Solitaires too; and according to the new model only men are Solitaires, according to the codex the first Solitaire was a woman, so even if the model is male, females who fill the role too, just like every part of Eldar society. GW is just too lazy to make female versions of HQ models Lol, stfu the coat of covers up the tits. Also, Solitaires are elites.) can play the role of Slaanesh, as attempts by anyone else results in insanity (according to lore this manifested as cannibalism, sometimes even while their victim was still alive, and psychosis leading them to attack any other Eldar around them). Generally even loners among the Harlequin, they do not usually travel with a Troupe permanently.

Incredibly powerful (even amongst the already crazy powerful Harlequin), the Solitaires are also an anti-psychic madhouse, inspiring psycho like blanks do, and even Eldar psykers feel incredibly depressed in their presence. The truth about their condition is, sadly, even more grimdark. Unlike the others, who are protected by their faith in Cegorach upon their death, the Solitaires are already doomed to be devoured by Slaanesh once they die - this is perhaps what allows them to play Her role in the first place. The only hope they have is Cegorach's last trump card, wherein He is allowed to challenge She Who Thirsts for their souls. He does not always win. However, every time Slaanesh wins, Cegorach was revealed to have lost on purpose, on the count of him replacing the soul in question with a realistic blow-up sex doll while Slaanesh was distracted. As the Prince of Pleasure attempts to fornicate with it, it bursts open, giving him/her/it the coldest of showers that would spoil any excitement he/she/it has built up. It also warps in Khorne for a short while in his realm so he can relive his "Piledriving Slaanesh into oblivion" times during the fall of the Eldar, minus Khaine. Slaanesh, for some reason, keeps falling for it every time.

Want to Join the Harlequins? Then Fuck You!

It's not known if recruiting for the Harlequins is done actively, or if they just take in any dispossessed Eldar. And it's not known what sort of criteria they look for (e.g. you're under threat of death by the Autarch for having a genuine sense of humor, the Laughing God is strong with one, etc.). However, any recruit has to pass the trial to become a Harlequin, and it's one of their best kept secrets. A leaked bit of old and probably retconed fluff was that this trial involved becoming possessed by a daemon of Slaanesh and casting it off through sheer willpower.

Obviously, the attrition rate was pretty high, with many just getting killed by the process, and those who succumbed to the possession were euthanized with a Kevorkian shuriken pistol. However, back in those days, if anybody got possessed and exorcised, it made them untouchable by Chaos; and for the Eldar, this would mean Slaanesh would lose the claim on that Eldar's soul. Sometimes, however, this process would result in an Eldar losing his soul, but surviving nonetheless. These soulless, pants-shittingly terrifying individuals became the Solitaires. But y'know. Old fluff.

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  Emphasis on 'colorful'.