From A Wiki of Ice and Fire
|Book(s) || The Winds of Winter (Appears)|
Marro is a mummer in Braavos.  He is part of the mummer's troupe at the Gate.
The Winds of Winter
Marro performs in the The Bloody Hand. He plays the part of the Stranger. As the troupe is readying themselves prior to the start of the play he tells Mercy to bring paste as his horn is coming loose. Mercy fetches the sticky paste and fastens the Stranger’s left horn back onto his forehead. Marro is in the opening lichyard scene with Bobono.
||By then Marro had appeared behind him, gaunt and terrible in the Stranger’s long black robes. His face was black as well, his teeth red and shiny with blood, while ivory horns jutted upwards from his brow. Bobono could not see him, but the balconies could, and now the pit as well. The Gate grew deathly quiet. Marro moved forward silently.
References and Notes