
Once a soul becomes a Hollow, it is driven by an eternal and insatiable hunger to devour other souls, living or dead, to fill the void caused by its descent. Tendenciesįishbone D, the first Hollow Ichigo encounters. When the chain completely decays, they become a Hollow when a hole opens up on their chest where the chain was attached, signifying they have lost their heart. The process can be accelerated under certain conditions, such as being attacked by a Hollow, giving into extreme despair, or using certain spiritual powers. The Chain of Fate slowly corrodes over time, coinciding with the degradation of the soul's ties to the living world. The process by which a soul becomes a Hollow usually takes months to years to complete, reflected by the length of the soul's Chain of Fate, which usually resides in the center of their chest, and connects to their bodies, if present. This can be prevented if a Shinigami gives the soul a Soul Burial before it turns into a Hollow. In doing so, the ghost warps into a Hollow and, ironically, often makes the focus of their obsession into their first victim, such as what Orihime Inoue's brother, Sora, does. At this point, some will become dangerously obsessed with fulfilling those goals, even if the means to fulfill them renders the soul empty: for example, killing anyone who comes near a loved one in order to keep them from hurting that person.

However, with only limited abilities to interact with the living, and by definition tied to their goals, many ghosts find they are unable to cope when their loved ones move on or old enemies forget them. However, some stay in the living world to fulfill certain goals, such as looking after a loved one, protecting a particular location, or pursuing a grudge from beyond the grave. The majority of ghosts peacefully move on to the Soul Society after their death. The Demi-Hollow transforms into a Hollow. Any spirit who is not guided to Soul Society by a Shinigami via Konsō may eventually turn into a Hollow. Hollow are former Pluses (deceased Human souls) who lose their hearts to despair or regret, or they remain in the Human World for too long.
