Sark

Sark is the overseer at The Harlequin. He is largely responsible for doling out punishments to the slaves.

Sark brings Luca books in exchange for sex. These books mostly came from the  'penny pile' at the market, and were usually University textbooks. This arrangement ended after Robert began bringing Luca books, though Sark did not acknowledge it until some time later. Bagoas reveals that Sark was infatuated with Luca.

After Asher is beaten by the Beast, Sark finds Luca and brings him to Boq's office to see him.