Borcas

"Report to Balkus when you arrive. Make no comment on his nose."

- Maester Aemon to Dareon Balkus is an unseen character in Game of Thrones. He is a member of the Night's Watch, and apparently chief among the stewards stationed at Eastwatch-by-the-Sea.

Season 1
When the newly graduated recruits are assigned to their orders Dareon is told by Maester Aemon to report to Balkus at Eastwatch-by-the-Sea, and warned not to comment on his nose.