Raptor

The earliest and easily the weakest of all Aizen's experimental Hollows, it is merely variation of a base class Hollow with twisted sense of purpose. It fought Noire Amakuni and would have given her a Hollowification-inducing wound were it not slain by Hyperion and Reginald Amakuni.

Appearance
Raptor appears in the form of a viscous collection of black goo with crimson fades. Amongst the chaotic mass is a white mask with a crude face carved. He houses a collection of bones which he is able to mold into feasible limbs such as legs and arms to crawl on.

Personality
A cunning yet simple minded Hollow, it seeks out prey either to feast upon or induce Hollowification as per modifications. He is proven to be both sneaky and devious, prefering to play with his prey before devouring them

History
A Hollow created( or rather modified) as a freak experiment by Sosuke Aizen in order to induce Hollowification unto either Souls or Shinigami while the former was still under the guise of a loyal Shinigami. Raptor consumed numberous Souls, yet none were able to survive the Hollowification process. During one of its hunts it went to prey upon Noire Amakuni and even selected her as its next experiment to undergo the Hollowification process, but was ultimately slain by Hyperion and Reginald Amakuni before it could carry out its scheme.

Abilities
High Spiritual Pressure: Its red spiritual power is strong enough to compare to Shinigami at 5th or 6th Seated Officer level and was easily able to overwhelm a young Noire Amakuni prior to her becoming a Shinigami.

Acidic Touch: Upon a Hollow touching a human with its hands, it is capable to induce a burn similar to acid being poured upon them.

High speed Regeneration: The Hollows ability to recover from wounds at high speed, except for either the brain or internal organs.

Experimental modifications
Hollowification-inducing ability: Due to the experimentations of Sosuke Aizen, Raptor has the ability to induce the Hollowification process unto Souls or Shinigami via the claws produced by its limbs. Souls and Shinigami unable to withstand the process undergo Soul Suicide.

Hollow Powers
Liquidification: Raptor's Hollow Ability is Capable of molding its existing body in anyway he sees fit, even accommodating its bones when taking in a liquid form. It is even capable of masking its spiritual pressure in its liquid form, but its is mobility is sluggish( though its still an ideal for sneaking up on unsuspecting prey). It can also reformat its bones during battle to harden them.

Trivia

 * Its appearance is based off of Arakune of the Blazeblue series.