Info on Soul reapers

Soul Reapers are departed human souls that have gained supernatural powers. As such, their bodies are composed of reishi and they can only be seen by other spiritually aware entities, which excludes most humans.

Combat

The most prominent power possessed by a Soul Reaper is their zanpakutō, a sword generated from the Soul Reaper's soul. Soul Reapers also naturally give off spiritual energy, which varies greatly in magnitude with the strength of a Soul Reaper. A zanpakutō is a physical manifestation of this force concentrated into a blade.

The second type of power Soul Reapers use is called Kido. It can be used for various purposes, such as healing, attacking, and restraining. Healing seems to be a more general skill, while attacking and binding require an incantation to be recited beforehand. Kidō spells are divided into two major categories: destructive spells, used for direct attack, and binding spells, which are spells that restrain someone or have other effects. These forms of Kidō spells are performed by calling out a complicated and often long-winded incantation followed by its category, number and name, which causes an effect once the name has been recited. Lesser versions of the spells can be used by skipping the incantation, but their effectiveness is reduced based on individual skill.

Hand-to-hand combatis not elaborated upon. Special Forces troops, especially those of higher ranks such as Soifon, are known to be well-trained in this field.

Agility, like hand-to-hand combat, it's not elaborated upon. Flash steps, or Shunpo, a movement technique that allows the user to move faster than the eye can follow, is implied to be part of this category.Another skill, though not necessarily related, is the Soul Reaper ability to walk on air using spiritual power. By collecting and solidifying spiritual particles beneath their feet, Soul Reapers can gain traction on thin air to either freely move about or to stop themselves from falling.

Specialty troops

Kidō Corps:
There is currently little information on the Kidō Corps, except that it takes students from the Soul Reaper Academy that excel in demon arts and that its operations are executed in absolute secrecy. The Kidō Corps are responsible for opening the senkaimon between the human world and Soul Society.

Stealth Force:
Also called the Covert Ops it has five divisions. The first division is the Executive Militia, the second is the Patrol Corps, the third is the Detention Unit, and the fifth division is called the Reversal Counter Force or Correctional Force.The 4th division's name or function is still unknown. There is little information about the operations of the special forces.

Originally, the stealth forces was completely separate from the Gotei 13. However, the head of the Shihōin clan, one of the Four Noble Clans, has traditionally inherited the title of commander-in-chief. Whenever the head of the Shihōin is promoted to a captain of the Gotei 13, these two groups become inextricably linked. Yoruichi Shihōin is an example of one such person when she was promoted to the captaincy of the 2nd Division. Due to this, the stealth forces were almost a part of the 2nd Division.

Vizards

The vizard are the antithesis to the arrancar: they are Soul Reapers who have obtained hollow powers. The associated process is referred to as "Hollowification" . Having begun as Soul Reapers, the vizard appear entirely human, and barring those times when they are using their powers are indistinguishable from ordinary Soul Reapers. To gain access to their hollow powers, a vizard dons a hollow mask. This allows them to augment their Soul Reaper abilities with hollow powers, as well as giving them access to some of the generic hollow abilities. Their spiritual pressure likewise changes into a mix of hollow and Soul Reaper.

It is unclear what the motives of the vizard are. The members of the vizard group have been shown to be former high-level Soul Reapers, exclusively drawn from the captain and lieutenant ranks. Soul Society's Central 46 considers them as having become hollows, and ordered that they be exterminated. The vizard are also rejected by hollows. Thus, it can be presumed that the only side the vizard are on is their own. Regardless, they seem to be valuable allies-to-be in the battle against Sōsuke Aizen's army of arrancar, as Kisuke Urahara mentions.The vizard have not shown any sort of hierarchy, seeming to prefer a loose-knit organization.