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Roman Sionis (better known under the alias Black Mask) is the main antagonist of the 2020 film Birds of Prey (And the Fantabulous Emancipation of One Harley Quinn).
He is a powerful Gotham City crime lord who serves as the CEO of the Janus Corporation and owner of the night club Sionis Below, as well as being the boss of Victor Zsasz.
He is also The Joker's rival in the underworld of Gotham. When Black Mask places a hit on Cassandra Cain, all Gothamites who work for him start looking for her, leading Harley Quinn and her henchwomen, the Birds of Prey to come to Cassandra's help (because Cassandra herself is one of Harley's minions) and do everything possible to bring down Sionis and his organization.
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- Black Mask is, so far, not only one of the few characters in the DC Extended Universe to be LGBT, but the first incarnation of Black Mask to be so. In the mainstream comic book continuity, Black Mask has always been depicted as straight.
- Unlike recent DCEU antagonists, Ewan McGregor's performance as Black Mask was praised by film critics, much like Margot Robbie’s reprisal as Harley Quinn.
- A reference to Black Mask was previously seen in Justice League, as a building of Janus Cosmetics can be seen as part of Gotham City's skyline.