Gregor ‘The Mountain’ Clegane
Kill Count: 13 (plus 100s+) So this one is a bit tricky. The Mountain on-screen has been seen lopping off heads, severing heads and popping heads like grapes. But we also know he was raping and pillaging the Riverlands at the behest of Tywin Lannister back in the first few seasons. His actual kill count should be north of 500.