Lurch - Ted Cassidy
The original Addams Family aired from 1964 and 1966. Although Lurch isn't necessarily a villain, he's still a monster. Ted Cassidy was chosen to play the faithful butler to the less-than-ideal Addams family. Cassidy was a whopping 6 feet and 9 inches tall, which was ideal for the character.
Aileen Wuornos - Charlize Theron
Serial killer Aileen Wuornos was highlighted in the film Monster. She was played by Charlize Theron who had to completely transform her life to play the part. She gained 30 pounds, damaged her hair, and had to add fake scars and tattoos to her body to complete the character.