From A Wiki of Ice and Fire
Bokkoko is a sellsword of the Second Sons. He is an axeman of formidable repute. He is homosexual.
The Winds of Winter
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This information has thus far been released in a sample chapter for The Winds of Winter, and might therefore not be in finalized form. Keep in mind that the content as described below is still subject to change.
As the battle outside the walls of Meereen is commencing, Tyrion Lannister emerges from the tents of the Second Sons. As he looks about he sees the sellswords saddling their horses and spies Bokkoko kissing his boy lover shamelessly.