Blood Ceremony's style has been described as "flute-tinged witch rock" and their lyrics are filled with black magic imagery and references to classic horror films.

[3][4] The band is fronted by singer/flutist/organist Alia O'Brien, whose flute solos are reminiscent of Jethro Tull's Ian Anderson.

O'Brien received a Canadian Screen Award nomination for Best Original Song at the 7th Canadian Screen Awards for "Ghost of Love (Onakabazien Remix)", which she cowrote with Sook-Yin Lee and Adam Litovitz for Lee's film Octavio Is Dead!.

[1] In a 2011 interview on Finland's NukeTV, O'Brien called their style "heavy rock" and claimed that their distinct sound is the result of each band member having different musical influences.

She cited late 1960s and early 1970s progressive rock as crucial to her inspiration, called Jethro Tull her "very first, favorite band", and also listed Black Sabbath, Uriah Heep, Osanna, Pentagram, Witchfinder General, Electric Wizard and Pagan Altar as having a major impact.