Sōsuke Aizen
In the fictional "Bleach" manga/anime universe, a is a "monstrous" ghost that if not slain and purified will feed on other souls. Many of the series' antagonists are "hollows". There are also hollows with Soul Reaper (a death-related entity)-like characteristics called . One of the series' main storylines has Sōsuke Aizen (the primary antagonist for the majority of the series) and his arrancar (particularly the ten Espadas, the strongest ones) as the force opposing the protagonists.