Pedro Lopez is a Colombian serial killer infamous for child murders, where he was convicted for killing 110 girls but confessed to more than 300 in total.
Jane Toppan was an Irish American serial killer whose thirst for sick and vulnerable people resulted in confessed murders not lower than 31.
Clementine Barnabet: The Voodoo Murders was a self-proclaimed voodoo priestess who killed African-American families as sacrifices for immortality.
Yoo Young-chul: The Raincoat Killer is a South Korean serial killer whose bitterness towards women resulted in 20 violent murders from 2003 to 2004.
John Wayne Gacy was a serial killer in the 1970s whose sexual desires for young men turned into rape, torture and murder, with a body count of atleast 33.