Dark Rukia

Dark Rukia is an alternate form of Rukia Kuchiki, resulting from her being merged with Homari and Shizuku, resulting in a non-vizard Hollowfication. She only appears in Bleach: Fade to Black.

Appearance
Appearing to be completely different, this Rukia dresses in a tattered, casual white kimono with what seems to be a long-collared red cape on her back. Her eyes have become snake-like and lavender, the same as her hair. She wears a golden cloth around her waist and no footwear.

Personality
Being born from siblings who erased all Rukia's memories, Dark Rukia retains none of her former personality. She seeks to destroy everything, which is spawned from the sibling's desire to keep Rukia for themselves.

Bleach: Fade to Black
When Rukia, who had her memories stripped, finally begins to remember people, Renji Abarai amongst others, the sister declares that she would never forgive Ichigo Kurosaki for trying to steal Rukia from them. She then proceeds to wish that she, her brother, and Rukia will become one, and it is granted, resulting in a twisted form of Rukia, referred to as "Dark Rukia" in the trailers. Renji deals with any other enemies for Ichigo, leaving him to do whatever necessary for "that woman."

Ichigo is forced to fight Rukia, but never attempts to actually attack her, instead only evading her attacks. He desperately asks her to remember, earning a reply that Rukia will erase her memories of him, destroying their bond. Ichigo, however, retorts that as long as he remembers her, the bond can never be broken. Dark Rukia is almost at the point of decapitating Ichigo, when she is intercepted by Byakuya Kuchiki's kidō. Byakuya and Renji inform Ichigo that Rukia is turning into a Hollow and must be destroyed.

Ichigo refuses, emphasizing on his bond with Rukia again, to which Byakuya replies that he may do as he wishes, and breaks the kidō and steps out. Dark Rukia immediately rushes to Ichigo again, but Ichigo states that it is his turn to give her power this time, much as she had done on their first day of meeting. He stabs her with Zangetsu, and gives her his power. With this, Rukia transforms back to a shinigami, and immediately collapses to his arms. He hugs her with one arm, as all other shinigami apparently regain their lost memories.

Powers & Abilities
Expert Swordsmanship Specialist: Dark Rukia wields a large and exquisitely designed dark red, double-edged scythe in combat. Despite its size, she uses it with great proficiency, able to contend with Zangetsu (though Ichigo was holding back).

Expert Hand to Hand Combat: When not swinging around her oversized weapon, she utilizes hand-to-hand combat rather than Kidō. In the movie and game, she also uses her feet for counter attacks.

Cero: In the trailers she appears to be firing what looks like a large, powerful red cero at Ichigo. This would make sense seeing as Byakuya stated she is becoming a hollow. It may also mean that the two siblings are arrancars. This is yet to be determined though.

Mysterious Second Form Dark Rukia also seems to be able to go into a second form during her fight with Ichigo. This is seen during the trailers, where she is seen unleashing a powerful blast of purple energy and her eyes become pitch black. She becomes much more powerful during this form, as she was nearly able to decapitate Ichigo

Trivia

 * Dark Rukia is playable in the Bleach video game, Bleach: Heat the Soul 6 and is amongst the few movie characters to be playable in a video game.