Limb Regeneration: Waverly and Wynonna Earp were both able to regrow limbs while possessed by Mictian.
Wish Fulfillment: Marzaniok is able to grant the wishes to whoever makes a deal with him. Also able to grant wishes are genies, though they become enslaved to their masters and must do what they ask whenever they are in physical contact.
Venomous: The Widows are able to release a paralyzing venom via a bite and by exhalation.
Sleep Powers: The demon Hypnos has the ability to cause the entire town of Purgatory to fall into a month-long sleep.
Rotten Jack - A seasonal demon who only appears on Halloween. He has a pumpkin for a head and kills people with a machete. He usually goes over after the same types of people - a sorcerer, a healer, a mother, and an angel. Wynonna killed him by striking him over the head with Peacemaker, which shattered his pumpkin head. Casey, being the extractor, removed the candle from Rotten Jack's head while Waverly blew it out. Rotten Jack fell to the ground and died.
Genies - Wish-granting demons who require physical touch for a bond to be formed. They can grant infinite wishes but can't grant people immortality or bring them back from the dead. Genies become slaves to their human masters, who are driven crazy by the power of wishes which leads them to killing people. Genies are usually told to kill people by their masters, which is what genies truly crave. The only known Genie, a woman named Ginny, was vanquished by Wynonna.