As GW has no codex about Harlequins i thought why not create one of my own. (yes i know their is a downloadable one but i find it hardly usable nowadays. + I wanted to add more stuff and change a few things. (don't mind spelling)

Special rules:
Eldar Harlequins have the following special rules.

Fleet of foot, hit and run, Furious charge (except the avatar of the Laughing god)
-Webway strike: This allows any harlequin unit to deploy from reserve wether the mission allows it or not.
-Tactical withdrawel: when a unit is forced to flee from the table the opponent only receives half the points of the unit instead of all the points. Only aplied when victory points are being used.
-Flip belts: Harlequin ignore difficult terrain.

HQ:
Avatar of the Laughing god. 0-1
A living incarnation of the laughing god, often a part of the still living laughing god. When defeated in combat that part used to create it misteriously vanishes.

Although not as strong as the Avatar of Khaine it is still a sight on the field

Ws Bs S T W I A Ld Sv Points
8 6 5 6 4 6 4 10 3+ 150

Special rules:
Deamon: By all means he is a deamon and is thuss effected by weapons which effect deamons. In addition he has a 4+ invulnerable save as well.

Strong willed: He knows when to fight on or to retreat hence he may choose wether to fail or pass a Leadership test.

Veil of tears: Any enemy unit must roll 2D6x2 when shooting at it. This is their spotting distance

Imunity to the mind: Pshiychic powers cannot affect the avatar even positive ones.

monstrous creature

Harlequin Avatars:
The leaders of the Harlequins and those who tell the story of the fall of the eldar when they meet.

Ws Bs S T W I A Ld Sv Points
7 5 3 3 3 6 3 10 5+ 70

Special rules:
-Independant character
-Invulnerable (his save is an invulnerable one.
-Dodge: in cc he has a 4+ invulnerable save.

Wargear:
-Shurican pistol, powerweapon, Plasmagrenades

Options:
He may exchange his shurican pistol for a fusion pistol at 10 points
He may exchange his powerweapon with a kiss for free
He may take a forcefield at 20 points (he gains a 4+ invulnerable save and gains +1 Thougness)
He may take a Jetbike at 30 points. (when combines with Force field this will give him T5 except vs Instabnd death)

He may take between 2 and 5 Shadow seers as bodyguard.

Elites:

Shadowseers:
Psykers in their own right they either act as bodyguard or as squad leaders.

Ws Bs S T W I A Ld Sv Points
5 4 3 3 1 6 2 9 - 45

Rules:
-Psyker

Unit size: 2/5

Wargear:
-Plasmagrenades, ccw, Veil of tears

Special rules:
-Invulnerable save of 5+
-Bodyguards: they can only be taken as bodyguards for a harlequin avatar they form 1 unit and so Shadowseers won't take up a slot on the force organisation chart.)

Options.
He may exchange his shurican pistol for a fusion pistol at 10 points
He may exchange his ccw with a kiss for 4 points or a powerweapon for 10 points
He may take a Jetbike at 25 points. (only when they have joined an harlequin avatar)
-1 shadowseer can be given a webway portal at 30 points. this allows the harlequins to enter play from it. Small blast marker, not available when on jetbike.

Solitaire: 0-1
He who treads the path of damnation, only one harlequin accepts this cruell fate. Not only that he is also the most dangerous harlequin of all)

Ws Bs S T W I A Ld Sv Points
6 6 4 4 2 7 3 9 4+ 150

Rules:
-Independant character, psyker

Wargear:
-The kiss of death: a stronger version of the kiss it will always wound on a 2+ regardless of thoughness. (further kiss rules aply)
-Fusionpistol, banshee mask
- He/she also has the doom pshycic power as per Eldar codex

Special rules:
-Invulnerable save. save is invulnerable
-Fearless
-Hidden deployment. The Solitaire may be held in reserve, when he/ she becomes available you may place him/her anywhere on the field without scattering.
-He may never join another unit
-Solitair assault: the solitair may make a 12"assaultmove, but rather than gaing a 1 A in cc for assaulting he gains +1 A for each 2"not used.

Option:
-The solitaire may be given a webway portal for 30 points

Eldar Rangers:
Some rangers eventually find their way to the Harlequins.

Refer to codex harlequins however they cannot be upgraded to pathfinders instead they may be upgraded to Harlequin ranges at +10 points per model.

Only then do they benefit from the harlequin special rules. In addition they always have a 5+ coversave and alwasy counts as being in cover

Troops:
Harlequin Squad:
The main and only troop choice available to the harlequin army.

Refer to codex Eldar.

Fast:
Harlequin jetbike:
Some harlequins take to the field on ultralight jetbikes.

Ws Bs S T W I A Ld Sv Points
5 4 3 3 1 6 2 9 - 35
5 4 3 3 1 6 3 10 - +10 (troupemaster)

Rules:
Fast infantry, skimmer

Unitsize: 3-10

Special rules:
-4+ invulnerable save, turboboost

Wargear:
-The bike is armed with a twinlinked shurican pistol, the rider is armed with a closecombatweapon

Options:
-1 member may be upgraded to a troupe master he/she also gains a powerweapon or a kiss for free.
-The squad may be joined by a Shadowseer on jetbike at 55 points this convers his abilities on the squad.
-All members may exchange their ccw for a kiss at 4 points
-up to 2 members may take a fusionpistol at 10 points
-1 in 5 may take a shrieker cannon at 10 points (R:24" S:6 AP:5 assault 3, pinning)

Venom:
The main troop carrier.

Bs Front Side Rear Points
5 10 10 10 85

Rules:
-Fast, skimmer, opentopped

Equipment:
-Brightlance, holofield, nightshield

Transport capacity: it can carry up to 10 men, but he may never transport a Solitaire.

Note: webway portals cannot be activated if the unit is till on the vehicle.

Heavy:
Deathjester:Some deathjesters form up and make complete squads to provide some heavy weapon fire

Statts and weapons refer to codex eldar, in addition the following may be added.

Death jester troupe master:
Ws Bs S T W I A Ld Sv Points
5 5 3 3 1 6 2 10 - +12

Weapons: shrieker cannon, plasmagrenades

He may exchange his shrieker cannon for the following:
-Eldar missille launcher at 10 points
-Fusion shrieker at 15 points (R:18 S:8 Ap:1 Assault 1, pinning)

He may also take tankhunter at 15 points (the whole squad gets it then)

-The may be joined by a Shadow seer at 45 points


Harlequin Wraith lord:
[I]The harlequin version of the eldar wraith lord. It can provide some serious fire power to the harlequins

Ws Bs S T W I A Ld Sv Pionts
5 4 10 8 3 5 2 - 3+ 100

Rules:
-Fearless

Weapons:
-2 flamers acting as a heavy flamer

He must add 1 of the following options:
Eldar missille launcher: 15, Brightlance: 30, Shrieker cannon: 10

When the first option has been fulfilled he may add a second option from the following entries:
Eldar missille launcher: 15, Brightlance: 30, Shrieker cannon: 10 (when 2 of the same weapons are chosen it becomes twinlinked)
Harlequins laugh: 40 points Proteced by a strange aura (usually a laugh over its face less head) it gains a 4+ invulnerable save.

So thats what i came up with critics adds and other stuff is always welcome so what are you waiting for. (Could use some proper field testing as well.)

I like it, everything good. especially the avatar of the laughing god.

It would make a good off shoot to a standard elder amy the same way all the chapters are all different from the standard SM's