Weasel

Weasel is a character in Game of Thrones. He is played by Paul Kealyn and debuts in the second season of the series.

Weasel, sometimes called Weese, is a steward at the castle of Harrenhal, in service to House Whent.

In the books
In the Song of Ice and Fire novels, Weese is the understeward of the Wailing Tower in Harrenhal. His name is 'Weese'. 'Weasel' is a different character, a young girl encountered by Arya Stark. For the TV series, it appears that the young girl Weasel has been removed and the name given to Weese.