Extermination Day only occurred in the Pride Ring, as sinners are regarded as the source of Hell's apparent overpopulation problem. The event took place on what mortal souls regarded as New Year's Eve, or December 31st.

Charlie: Charismatic and compassionate, female. Princess of Hell.
Vaggie: Strong, level-headed, protective, Charlie’s girlfriend.
Alastor: Sadistic, polite, arrogant.
Angel Dust: Brash, sarcastic, quick, sharp wit.
Niffty: Hyper, spontaneous, agile.
Husk: Ill-tempered, grumpy.