Like all spiritually aware Humans, Fullbringers can sense the Reiryoku of other spiritual beings, such as Hollows, Shinigami, and other Fullbringers. However, they differ in that they each have a parent who survived a Hollow attack before they were born. As a result, traces of the Hollows’ power remained in their mothers’ bodies, which were then passed onto them at the moment of their birth. Consequentially, their powers more closely resemble a Hollow’s than those of a Shinigami.

Their ability, called Fullbring, enables them to manipulate the souls contained within matter. Everything, even rudimentary objects such as lampposts and chairs possess a soul, however small. By using their power to “pull” on this soul, Fullbringers can manipulate the object's movement or even alter its physical characteristics. For example, Fullbringers could have a beverage assist them in drinking it by pulling on its soul, drawing it into their mouth. Likewise, by pulling on the soul of water, Fullbringers can walk across its surface without falling through. Many more feats are possible, making the technique highly versatile. Unlike other spiritual beings, Fullbringers use their power with their physical bodies. Because of this, they must train extensively to build up their stamina so they can use it properly.

While all Fullbringers are born with this power, the age at which they come to realize it varies. When Fullbringers die, all traces of their abilities disappear from the world. However, they do carry their abilities into the afterlife.