The King's own Uncle Imp.
Game of Thrones Season 4, Episode 1
the Imp rounded on him.
Game of Thrones Season 4, Episode 6
Dwarf? You should have stopped at IMP.
Game of Thrones Season 2, Episode 2
Speak, Imp.
Game of Thrones Season 1, Episode 6
The Imp.
Game of Thrones Season 1, Episode 3