Buffy The Vampire Slayer
Role: A Slayer called when Buffy dies (for the first time).
The painful truth: Oh God. That mock Jamaican accent - the vocal equivalent of chewing on tinfoil. Okay, to be fair to actress Bianca Lawson, she was only asked at the last minute to do the accent, but we still had to endure the results. If you could ignore the accent (presumably you were watching with subtitles) she was still an annoying, blank-eyed, personality vacuum.