From Lexicanum

The Harlequin Army List, created by Gav Thorpe and published in Citadel Journal 39, is made up of primarily close combat troops, although their firepower is as strong as that of craftworld Eldar. The Harlequins are especially suited for close combat due to their extreme speed and agility, far outpacing even the Dark Eldar. Their army list is presented as experimental and unofficial. Also, see Harlequin Armoury for details on their weapons and wargear.

Army List

• Great Harlequin - leader of the troupe and player of the part of the Laughing God
• Shadowseer - similar to Farseers but able to disorient enemies and use misdirection to overcome them
• Solitaire - lone warriors who seek out those they believe to be able to join the ranks of the Harlquins but also play the role of Slaanesh in the tale of the Birth of the Great Enemy
• Death Jester - Morbid Eldar with a passion for heavy weaponry, also playing the part of death in Harlequin plays
• Harlequin Warrior - Basic versatile warrior but strongly oriented towards combat
• Harlequin Jetbike - Fast attack unit mounted on highly decorated jetbikes; they are the most lavishly decorated unit in the force
• Venom - Shares the chassis of a Vyper jetbike but with the heavy weapon turret removed to give a small transport capacity, ideal for travelling through the webway and on the battlefield

Sources

• Citadel Journal 39
• Harlequin Army List
• Harlequin Army List (PDF)