Homura

Shizuku was the name given to one of two of Rukia's "siblings" that held her captive and erased her memories.

Appearance
Dark Rukia took much of her appearance from Shizuku. He has dark lavender hair, light eyes, and resembles Sōjirō Kusaka but with paler skin. He also wears the red cape on his back and white kimono, both having long collars.

Personality
He and Homura erased Rukia's memories so that they could keep her all to themselves, and pretend to be her siblings. After that failed, they merged to created Dark Rukia, a being undergoing hollowfication, whose goal is to destroy anything that is in their way.

Synopsis
While Homura distracted Rukia, Shizuku slashed her with his scythe, supposedly erasing her "heart" and memories. With that, they act as if Rukia is their older sister and tell her that she still hasn't given them names. However, their plans could be ruined when Rukia begins to remember her friends, particularly Renji Abarai. This leads Homura to wish that all three of them to become one. Once this is granted, they transform into "Dark Rukia."

Everyone was supposed to forget her, but Ichigo retained their strong bonds. This led him to attack Dark Rukia, but still hold back in fear of hurting her. It isnt until Byakuya Kuchiki and Renji explain that she is undergoing hollowfication and must be killed, that Ichigo gets an idea. He stabs Rukia with Zangetsu, transferring his powers into her. This separates the three. Before fading away, the siblings are finally given a name by Rukia.

Powers & Abilities
Expert Swordsmanship Specialist: Shizuku wields a single-edged red scythe that is taller than himself. Still, when using it to take away Rukia's memories, he handled it with great ease.

Teleportation: Shizuku has the ability to teleport a distance in order to counter attack his opponents. It could also be used to move to other places, similar to Shunpo or Sonído.