Siann is one of three beautiful loyal servants of Quan Chi, the other two being Mika (Jaime Pressly) a light-skinned blonde woman, and Sora (Renee Tenison) a dark-skinned woman with curled raven hair. They first appeared as lifeless corpses that were part of the Netherrealm. Quan Chi used his powers of sorcery to allow them to have a living form. The three were skilled fighters as well as masters of manipulation, and expert assassins. Despite their loyalty, Quan Chi often mistreated the three and threatened to return them to their previous states if they failed or betrayed him.
The three girls performed many tasks for Quan Chi, making enemies out of Kung Lao, Taja and Siro, as well as Emperor Shao Kahn.
Siann is the strongest of the three. She was able to defeat Kung Lao in combat and even Shang Tsung. Mika is a fair fighter, able to effortlessly defeat normal warriors but struggled against skilled fighters such as Kung Lao. Sora was the weakest, hardly getting in any blows to her opponent and was easily incapacitated. Despite the flaws with Mika and Sora however, the three girls usually fight together, and they work as a seamless team.
Siann appeared in Mortal Kombat Federation of Martial Arts, but not Mika and Sora. She lost to Sub-Zero in the first match, but defeated Shang Tsung in another.
In the final episode, Vengeance, the girls were joined by a fourth assassin named Cilene, who was beheaded by Shao Kahn's Shadow Priests. Siann was also killed by the Shadow Priests.
- Dana Hee appeared as Mileena in the 1997 film Mortal Kombat: Annihilation.