I’d have to say Officer Tenpenney from GTA: San Andreas, right from the off you hated him and he was such a good enemy. Finally killing him you were like “yeahhh”. 

Having said that, there’s loads of times i’ve raged at games, but not many characters I’ve actually raged at. Most recent time I’ve hated a character was in Infamous 1 when I finally decided to play it after months. Hated Zeke for doing what he did and then the main boss battle right at the end, I was fuming at that because it was so difficult and he kept destroying me…