Hsien-Ko

According to the backstory of Night Warriors, Hsien-Ko (Lei-Lei) was born in the 1730s, along with a twin named Mei-Ling (Lin-Lin)—both of the family Shao.

During this time, ghosts and spirits of the dead arose from their resting places and attacked a rural Chinese village.

After their mother was killed by a powerful demon (said to be Pyron), she and her sister decided to use "Tensei-no-Jutsu" to save her.

They use a prohibited technique, "Igyo Tenshin-no-Jutsu", and fought to release their mother's soul from the dark.

This turned the twins into a jia-ngshi- ( "hopping corpse"), a type of Chinese zombie.

This gives them unusual abilities which they use to fight. Mei-Ling is actually the fú ("ward-paper") on Hsien-ko's hat.

Hsien-ko's powers cannot be fully controlled unless Mei-Ling does so herself, when she becomes the ward-paper.

If she separates from Hsien-ko, many of Hsien-Ko's abilities no longer work, so they essentially fight as one.

Hsien-Ko is the "body", and Mei-Ling the "mind".

Mei-Ling does come out to team up with Hsien-Ko, as seen by their Dark Force ability in Darkstalkers 3.

In the anime, Hsien-Ko seems to be more in control of her body, as she is warned by her sister not to kill their assailants when they are attacked by a group of drunken humans.

The two fight many battles during Night Warriors, eventually winning the freedom of their mother's soul but at the cost of their own lives.

Before death, however, the spirit of their mother claims she will not let oblivion become their reward and the twins' souls are reborn as infants in a new life.

In Vampire Savior, the reincarnated sisters live a happy, normal life.

However, on their 16th birthday, weird things begin to happen to them.

They have the same dream and the next night they fall into a coma, their souls transported to the Dark Realm which calls to them.

They find themselves in weird costumes and, although their memories of their past life are sketchy, things begin to slowly come back to them.

They regain their unique power of transformation they had lost during death.

Now, as saviors and hunters once more, they must find their way home to the Earth Realm.

After the events of Vampire Savior, the sisters are engulfed by the darkness, but their mother's spirit saves them and they return back home as humans once more.

Links
Capcom Wiki
Darkstalkers Wiki
Copyright Owner
Capcom
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electricferret.freeforums.net/thread/200/omniverse-pt