Demons

Summary
Demons are beings created in Hell. While they're thousands of these creatures, they do have a loose hierarchy (This is mainly based off of power, not really respect, if that makes any sense)

On the top are fallen angels. These are the angels who have been banished from heaven. Even without their wings or halo, these angels are much more powerful than pure demons. Usually the ones who had been banished with Lucifer during his rebellion are more respected than recently made fallen angels.

Next are the 72 demons mentioned in the Lesser Key of Solomon. These demons were made by Lucifer himself. When creating these demons, Lucifer wanted to make a being that could compared to angels in power, but not necessarily in appearance. These demons are much more powerful than other lesser demons, and usually have small legions that follow their orders. The 72 don't exactly have any sort of hierarchy between themselves, but they do have many political differences, especially regarding interference in Earth, which splits them into small factions.

On the bottom are Lesser Demons, who are usually made to perform grunt work (though some of them just chill on Earth doing their own thing).

Demons (excluding fallen angels) have the ability to consume human souls for power. Though eating souls don't give them much power, it accumulates over time. Many collect these souls as a sort of sport, not necessarily for power. The traditional way of collecting souls is to make soul contracts, where a demon would offer a human a favor in exchange for the soul once their task is done. However, another (and more effective way) of collective souls is to trick or herd people into giving up their souls by forming cults.

Fallen Angels

 * Altair (Achazriel) - Former guardsman under archangel Haziel. Became a spy for Lucifer's rebellion but was ultimately caught and thrown to Hell by Inias
 * Ky (Kokabiel) - Former angel of the stars, ran away from Heaven during the Rebellion and stayed on Earth
 * Micah (Inias) - Former right hand man of archangel Micheal. Turned coat after witnessing and experiencing Micheal's abuse.

Lesser Key of Solomon

 * Agares - The second demon of the Lesser Key of Solomon. Is said to bring back runaways, cause earthquakes, and create/teach languages
 * Vephar - The forty second demon of the Lesser Key of Solomon. Is said to have the form of a mermaid, though in reality Vephar is able to summon eel-like leviathans. She is able to bring storms in sea, and curse people's bodies to begin decaying. Within three days, worms and maggots will begin growing in the person's body