Gatekeepers

The are the guardians of Seireitei's gates.

Overview
The gatekeepers are charged with protecting Seireitei from intruders by ensuring that they do not pass through the. All four gatekeepers are individuals of incredible size, and are considered elite members of Soul Society. Each one of them is assigned a specific gate to preside over.

Synopsis
Jidanbō is the only Gatekeeper that Ichigo's group fought when attempting to enter the Seireitei. The other three Gatekeepers are only briefly seen, having betrayed Soul Society and become agents of Aizen, who had hypnotized them. The three are easily defeated by Jidanbō and Kūkaku Shiba.

Trivia

 * Jidanbō had said that the other Gatekeepers were on very good terms with each other. Because of this, their nonchalant attitudes towards one of them falling is thought to be so due to the effect of Aizen's Zanpakutō.