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In the fictional Bleach manga/anime universe, a Hollow (虚（ホロウ）, horō) is a kind of monstrous lost soul who can harm both ghosts and humans. Many of the series' antagonists are hollows. There are also hollows with Soul Reaper (a death-related entity)-like characteristics called arrancars (破面（アランカル）, arankaru, from Spanish arrancar "to tear off," kanji translates as "broken mask"). 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.
The creator of the series, Tite Kubo, used many Spanish motifs for the series' hollow-related elements. The fictional creatures have been praised by reviewers for the early hollows' strong emotional ties to their victims and the "interesting" concept of the arrancar. The visual appearance of the characters has also been commented on.

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