From A Wiki of Ice and Fire
The fat fellow is a secret servant of the Many-Faced God in the House of Black and White in Braavos and a Faceless Man.
He is fat and fierce black eyes, with a hook nose and a wide mouth full of yellow teeth.
A Feast for Crows
He is one of the three servants of the Many-Faced God who come most often to the House of Black and White. When he meets with the squinter, Umma has Arya Stark pour for them.
A Dance with Dragons
He comes to the meeting of the eleven priests of the Many-Faced God at the House of Black and White through the front door. Before the handsome man agrees to give the gift to a man, the fat fellow says, "I know this man."
- ↑ 1.0 1.1 A Feast for Crows, Chapter 22, Arya II.
- ↑ A Dance with Dragons, Chapter 64, The Ugly Little Girl.