9CHARLES PERCY - GLAD
There seemed to be no end to Charles Percy's irritating antics until he died in season six. When he and the other Mercy West residents transferred to Seattle Grace in the merger, Charles was portrayed as arrogant, and was quite hard to like as a result.
His death happened in the infamous hospital shooting. It's sad to say that this resident's only redeeming qualities surfaced then, making his final moments as he died in Dr. Bailey's arms, touching, memorable, and even a little bit tearjerking. But his character has probably long-since faded from most fans' minds at this point in time.