The sons of the Harpy– the guerrillas fighting Daenerys after her conquest of Meereen – appear to be using masks on the show, in a strange reversal. In the novels, the brazen beasts—freedmen and others who support Daenerys and patrol the city on her behalf—wear animal masks to hide their identities and protect themselves from retribution to the hardliners opposed to Daenerys, while the sons of the Harpy are simply anonymous killers who blend into Meereenese society, which gaudy masks kind of don’t fit into.
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Unsullied, Sons of the Harpy, Season 5, S5 Trailer, S5, Meereen