Using the other Harlequin models and some sneaky choices, here is an additional allies list using the Dark Eldar codex.
500pts (499pts) Harlequin Allies (Dark Eldar Codex)
Archon (High Warlock) – Phantasm Grenade Launcher, Blast Pistol (laspistol), Husk Blade, Shadow field – 165 pts
Harlequin Troupe (New Harlequin models except death jester) – Troupe Master with pistol and power weapon, harlequin with pistol and close combat weapon, 2 x harlequins with kiss and pistol, 2 x harlequins with fusion pistols and close combat weapons, death jester – 184pts
Wyches – 4 x wyches (old harlequin models) with haywire, Hekatrix with Blast Pistol (laspistol), haywire and power weapon , Venom transport – 150