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- Pence: currency is put into the mouth of the dead, to pay their way into the boat of Charon.
- Ocioneo: Chief of the demons or evil spirits that rebelled against Jupiter, according to the Assyrian Jerecides.
- Og: One of the descendants of the fallen angel giant Semyaza.
- Olivier: One of the fallen angels, belonging to Choir of the Archangels.
- Oray: Grand Marquis Avernal court, which is in the form of a good goalkeeper continent. Fueling the fighting, increased mortality in the field. Has at his command 30 Legions of demons.
- Orgeuil: One of the demons were exorcised by Elizabeth in 1639 by Francois Allier Faconnet.
The two demons who lived in this woman for over twenty years, managed to possess through a crust on her bread into her mouth at the age of 7 years. The name of another demon that possessed her, is Bonifarce. - Orias: Demon of the astrologers, fortune tellers, great marquis of infernal rule shown in the form of an angry lion riding a huge horse with a snake tail and carries a snake in each hand, knows astronomy and astrology teaches, transforms men , and his will, makes obtaining dignities and titles and send legions 340.
- Otis: President of hell, which appears as a terrible snake. Knows the past, present and future. Has many friends and enemies. Manda diabolical legions in 60.
- Ovadiche: Genius or demons believe that the minstrels were inspired, he is the one who reveals future things.
- Ouza: also Uzza, one of the fallen angels.
- Oze: Grand President of the underworld that is presented in the form of a leopard, or in the form of a man, makes his supporters working in the liberal arts, answers on divine things and abstract, transform man and makes him mad to the point of thinking it is a king or the pope, Oze brings crown but his reign will not last more than an hour a day.