Lilith (Darkstalkers)

Lilith Aensland is an anti-villain from the Darkstalkers game series. She is a miniature succubus who was created from energy drawn from the succubus Morrigan. This dangerous excess energy was separated from Morrigan at birth by her father, Belial, who sealed it away. The separated energy formed a mind of its own and named itself Lilith.

Story
Belial, the ruler of all Makai and Morrigan's adoptive father, foresaw that Makai would be exposed to the crisis of perishing soon. Someone with great power would be needed to maintain the unbalanced world of Makai. Using his near omnipotent foresight, he predicted that one which such power would not be born in the family of Aensland for another 1,200 years. Knowing this, he personally selected Morrigan as his immediate heir.

Morrigan was a very special succubus; she was born as an "S class" noble. But at that time, a struggle for power had already started between the noble houses. Numerous battles had occurred in various locations. It was unacceptable for a Succubus child to be given such rights to power. To complicate matters further, Morrigan had no way to control the enormous powers that she held within herself. If she were to be left unguided, she would destroy herself and the land around her. Thus, Belial decided to split her powers and isolate them in order to protect her. Morrigan's soul was split into two, one of the halves was isolated in a negative space that Belial had specifically created.

Belial intended to return the sealed off portion to Morrigan when she was able to control her powers but died before he could. The sealed-off power had begun to have its own will, becoming Lilith. She had begun to recognize herself roughly a decade after the sealing process. As Lilith found out about Makai, her feelings grew. These feelings were different from normal emotions like admiration and jealousy, they were closer to a primitive instinct to return home...

In Darkstalkers 3, the demon Jedah releases Lilith and gives her a body -- that of a smaller, more cheerful succubus. In return, Lilith was to lure Morrigan and the other Darkstalkers to him. Lilith seems to enjoy her life until she realizes that she is not the "original" -- she is only a part of another person. She discovers that she often becomes transparent and realizes she has limited time to find her "soul mate", in order to continue her existence. Morrigan also feels that Lilith is a part of her, but she does not feel she needs Lilith as badly as Lilith needs her. Jedah realizes this, and he manipulates Lilith to meet Morrigan so he can use them both to extend his power. However, Lilith knows that Jedah is lying to her. Lilith is only absorbed by Morrigan in Morrigan's ending leaving Morrigan, like Lilith, with a more cheerful personality, a new view on the world and her full power. In Lilith's ending, she seems to fail to reach Morrigan's unconscious body in time and appears to fade from existence seconds before Morrigan wakes up, though Morrigan again seems to feel something has changed within her, meaning that Lilith actually succeeded in returning.

Role in the Vs. Series
Lilith constantly appears alongside Morrigan in the Versus Series. In Marvel VS Capcom: Clash of Super Heroes, she appears in Morrigan's intro-pose, where she enters her body again, and in one of her victory poses, and in her taunt, she also appears in the hyper combo Silhouette Blade. She is also a secret playable character in this game, where she mind-swaps with Morrigan.

In Tatsunoko VS Capcom: Ultimate All-Stars, she appears in Morrigan's Darkness Illusion hyper combo.

In Marvel VS Capcom 3: Fate of Two Worlds and Ultimate Marvel VS Capcom 3, a shadowy figure Lilith's silhouette appears in Morrigan's Shadow Servant hyper combo, which is basically the same as Silhouette Blade. She also makes cameo appearences in some endings.

Other appearences
In Namco X Capcom, Lilith is given a major role, as she is also searching for her true body, but its manipulated by Lord Raptor and his allies to fight the player's party. She later becomes playable.

In Cross Edge, she appears as a boss alongside Demitri, but later becomes playable.

In Capcom Fighting Evolution, she appears in Felicia's ending.

Trivia

 * During development, Lilith was intended to be the half-angel sister of Morrigan.
 * Two of Lilith's moves contrast Morrigan's moves in their title. While Morrigan has Shadow Blade and Darkness Illusion, both having to deal with the "dark", Lilith has the same two moves only they're titled Shining Blade and Luminous Illusion, both dealing with the theme of "light". That is very controversal, as Lilith's powers are the same as Morrigan's.
 * In the Versus Series, Lilith constantly appears outside Morrigan's body, meaning that her conscience still exists, and, when Morrigan allows it, Lilith can leave her body.