Shakugan no Yubi (Zanpakuto spirit)

Shakugan no Yubi (灼眼の指, Burning Eyed Ring) is the manifested spirit of Ren Kaidou's Zanpakutō as well as her inner Hollow. She has been variously called Hollow Ren (虚 (ホロウ) れん, Horō Ren), more properly called The Hollow within Ren's conscience (れんの内面 (ないめん) の虚 (ホロウ), Ren no naimen no Horō) or White Ren (白れん, Shiro Ren)

Appearance
Shakugan no Yubi appears to be virtually identical to Ren, except inverted in color. She is a fairly tall and lean-built being with white skin and hair. Her eyes consist of red cornea and grey sclera. She has black nails. While Ren wears a standard black Shinigami shihakushō, her Zanpakutō spirit wears a white shihakushō with a black cloth belt. She wears a mask greatly resembling Ren's Hollowfied form from her battle against Jillian Ciffer, and has white, waist-length hair along with a white version of Ren's shihakushō in Bankai form and white ring with red outline appear on her back.

Personality
Shakugan no Yubi's most distinguishing features are her maniacal laughter and psychotic grins. She is brutal, arrogant, disrespectful, and sadistic. Shakugan no Yubi's reason for existence is to take over Ren's power and body and use it to kill everything and anything she sees, as opposed to Ren's desire to protect. Though she taunts Ren as being a weak and unsuitable counterpart of herself, she relishes the idea of Ren growing stronger as she also grows stronger as a result. Unlike Ren, she battles like a berserker, ignoring injuries and overpowering her enemies with brute strength and force. She protects Ren's body when she is about to die because if Ren dies, she will as well. Due to her status as a Zanpakutō spirit, Shakugan no Yubi doesn't get much opportunity to fight and gets really excited on the rare occasions she does get to fight.

Shakugan no Yubi has declared Ren is the "queen" of the inner world, and she is the "knight". Shakugan no Yubi wishes to "take the crown" from Ren so she can have control over her body and become the dominant personality because she refuses to put up with Ren's softness of trying to defeat her enemies with reason and logic, which would eventually result on both her and Ren getting killed. After her loss, she states she is willing to allow Ren to keep the crown for now, but once Ren "screws up again", she will make his move once more. Shakugan no Yubi made good on this promise when Ren was nearly killed against Jillian Ciffer, at which point, she took control of Ren's body once again

Plot
TBA