Kiyomori Mashiro

Kiyomori Mashiro (真白清盛, Mashiro Kiyomori) is the former captain of the 10th division. After his hollowfication and defection from Soul Society, he resides in Las Noches and conspires with Gin Ichimaru, Kaname Tosen, and Sosuke Aizen.

Personality
As a captain, he was kind and caring towards his subordinates. Much like the current 10th division captain, he was easily approachable by his members. He was very loyal to Soul Society and could not bear the thought of leaving it.

After his defection from Soul Society, he has a very grim and cold attitude towards others, much like that of Ulquiorra Cifer. After learning about Central 46's decision to destroy him and the other Vizards, he became angry and sworn revenge against Soul Society.

History
Approximately 110 years before the main storyline, Kiyomori served as the captain of the 10th division and is seen welcoming Kisuke Urahara as the new captain.

During the vanishing souls incident, he was one of the captains sent to investigate. During that night, he along with his fellow captains and other to-be-vizards were hollowfied and was later rescued by Yoruichi Shihoin. After Urahara's attempt to reverse the hollowfication process failed, Kiyomori started to panic and tried to rip his mask off by force. He had only succeeded to shatter half his mask which unusually resulted his permanent transformation into an Arrancar

Distraught at the recent events, he tried to return to Soul Society and return to his post, but was stopped by several members of his own division. The members wanted to arrest Kiyomori peacefully under the command of Central 46, but Kiyomori refused. Instead, he became enraged and tried to walk through. When the division members tried to attack him, he quickly unsheathed his Zanpakuto and attempted to fight. He contemplated that if everyone now considers him a hollow, he'll just have to start acting like one. He thought that if he was really a hollow, he should have hollow powers and attempted to use a Cero. The blast instantly killed everyone who was caught and the reiatsu of the resulting attack could be felt from miles away. Amazed at his own results, he thinks that if it was meant to be this way, then maybe it is better. Before using Garganta to go to Hueco Mundo, his former lieutenant see's the massacre and stares at him in disbelief. He tells her that this isn't the end yet and proceeds to Hueco Mundo.

Once in Hueco Mundo, he is seen negotiating with Aizen and offers him his powers to help achieve Aizen's goals. Aizen wonders if Kiyomori is upset about what he has done. However, Kiyomori responds in the negative and instead thanks Aizen for the gift.

Powers & Abilities
Kiyomori's circumstances are quite unusual. Although originally a Shinigami who had obtained Hollow powers, he is different from the other Vizard in the sense that his Hollowfication is permanent and does not need to don a mask to access his Hollow powers.

Sonido Master: Kiyomori is masterful in Sonido, as seen when he is able to create after-images of himself during his rebellion against his own division members.

Garganta: is how Arrancar move to and from Hueco Mundo. Kiyomori was shown using it to travel to Hueco Mundo from Soul Society.

Cero: During his encounter with his former subordinates, he is seen able to fire a red Cero from his mouth powerful enough to be felt from miles away. Now, he can fire a Cero from his index finger or his entire hand, though the Cero seems to be weaker in power compared to the past. This could be due to his sealing of Hollow powers since then.

Immense Spiritual Power: As a captain, Kiyomori already had a potent ammount of spiritual energy that is comparable to that of Kyoraku and Ukitake. After his Hollowfication, this is increased further. His spiritual power is red.

Enhanced Hierro 

Zanpakutō
Sunao: In its sealed state, Sunao looks like a regular Katana.
 * Shikai: Sunao's release command is "absorb" (吸い取れ, suitore). The blade turns burgundy-red in color and a red mist surrounds the blade.


 * Shikai Special Ability: In it's released form, Sunao can absorb an opponent's spiritual power as well as any attack that is made of spiritual energy such as Kido. The energy can absorbed is stored which seems to have no limit. When Kiyomori runs is not at maximum spiritual power at any time, the energy absorbed can be used to replace the used energy to keep him fighting at his maximum power. On the other hand, when Kiyomori is not fighting, the energy he has not used can also be conserved for later use. This amount that can be stored seems to be limitless.


 * Bankai: Reishoku no Sunao (霊食の素直, Spirit Energy Eating Sunao'): Kiyomori's Zanpakuto crystallizes and encases onto his right arm which appears to be a large sharp blunt weapon with a chain attached with seals around it.
 * Bankai Special Ability: The techniques of his Bankai are similar to his Shikai, except at a far greater scale. He is able to release a red mist similar to Baraggan's Respira which drains the spiritual energy of anyone who is caught in it and stores it for later use. The rate of absorption is quite fast, able to cause Ichigo to revert from his Bankai back to his Shikai in a matter of seconds. The mist can also be used to surround himself and create an nearly-impenetrable defense against any reiryoku-based attacks. This provides Kiyomori with absolute defense as any melee attacks cannot cut his Hierro without reiryoku behind it.


 * Gentei Kaijo: Kiyomori destroys the chains on his Zanpakuto to use this ability. This ability, which is named after the limiter release of Soul Society, allows Kiyomori to unleash every ounce of spiritual power he has ever absorbed and conserved which can enhance his spiritual power to staggering degrees. Kiyomori has shown to be able to release a certain limit at a constant rate or release all the power at once. Kiyomori states that his Zanpakuto has conserved his spiritual energy for over a hundred years to the point that his spiritual power far exceeds that of Aizen's hogyoku-enduced transformation or Yamamoto. However, once the conserved power is used, it will not restore on its own.
 * Enhanced Cero: In his Bankai state, Kiyomori has been shown to fire a potent Cero from the tip of his Zanpakuto. The Cero is powerful enough to destroy a good portion of Karakura Town. This is evident that his Bankai not only supplements his Shinigami abilities, but his Hollow abilities as well.


 * Resurrección: Reishoku no Sunao: Uroboros (霊食の素直：ウロボロス, Spirit Eating Sunao: Tailbiting Dragon): The release command is "Consume more" (もっと食い尽くせ, motto kuitsukuse). A thick red fog covers Kiyomori's entire body as he calls out the release command. In his Ressureccion, he retains his Arrancar hakama while he loses his upper-clothing which is now covered in an armour-like Hollow bones, white Hollow-bone wings with some crystallized remains on some sections of his wings, he also grows a dragon-like tail similar to that of Toshiro Hitsugaya. His Hollow mask remains now cover the entire top of his head.