Kouran can be fielded in a Dark Elf army. He counts as a Lord choice He must be fielded exactly as described here and may not be given any additional equipment. He must be the army's General if taken, unless Malekith is also in the same army.

ouran is a cunning commander, renowned for taking risks, though always claiming victory in the end. Once he sacrificed half a Dark Elf army to draw the enemy into a trap, caring nothing for the lives of those who served him. He is an extremely efficient leader and is respected and feared by the Dark Elves under his command.

Kouran, Captain of The Black Guard

Points: 255

Weapons & Equipment: Kouran is armed with the Blade of Ensorcelled Iron, and the Armour of Meteoric Iron.

Blade of Ensorcelled Iron: Gives +1 to hit in close combat.

Armour of Meteoric Iron: This gives Kouran a 1+ save which cannot be improved by any means.

Unparalleled General:
Kouran has one of the finest military minds in the world, uncluttered by compassion, mercy or ego. Whenever a scenario requires players to roll a dice to determine something (table edge, who deploys first, who gets the first turn, etc) then the Dark Elf player gains a +1 to these dice rolls, in addition to any other modifiers.

Captain of The Black Guard:
Kouran must be deployed with a unit of Black Guard and may not voluntarily leave that unit. However, if Kouran is in your army, Black Guard are a Special choice instead of Rare. This means if you have both Malekith and Kouran in an army, you may take Black Guard units as Special choices and they are no longer 0-1. As a member of the Black Guard, Kouran is subject to the rules hatred and stubborn.

Eternal Hatred:
The Black Guard are vicious killers and hate everybody and everything. In addition, hatred continues to have an effect in second and subsequent rounds of a combat. As the Captain of the Black Guard, Kouran is subject to these same rules.

A miniature of Kouran was never created, however, here is an article explaining how to create and convert your own.