Demons

For as long as man can remember, there has always been legends of beings made of pure evil, commonly referred to as demons.

Demons are vile beings made of pure black matter (Darkness). Generally evil, demons love nothing more than spreading misery, and death across the multiverse.

Most demons live in the Realm of Darkness.

Original Demons
Imp

Blackspawn

Gargoyle

Hell Trooper

Daemonknight

Hell warrior

Skull Knight

Crollmer

Oak

Minzataur

Shadow Oracle

Daemonhound

Gorehorn

Skelodrag

Hell Raiser

Dark Amazon

Hell Dealer

Rawk

Volt

Death Crow

Flesh Hydra

Hell Babler

Huraogoth

Hell Seeker

Hell Smith

Demon Eye

Crawler

Picker

Grymer

Cerberus

Scrachetch

Traeyghrin

Snakerag

Junkdrake

Erinye

Heloc

Hell Boom

Hell Fairy

Hell Cutter

Cow Demon

Amacubus

Coldfire Demon

Hell Reacher

Hround

Magma Bird

Hell Grenadier

Hazard

Bone Vulture

Krostro

Kellareeth

Slaughter Knight

Hell Runner

Zilyther

Carnivorous

Bonehound

Skrop

Zwurm

Bludg'n'Har

Ripsaw

Proakrin

Corolith

Fallen Angel

Keralith

Doom Crawler

HellSide

Overlord of Darkness

D&D and Pathfinder Demons
Babau

Balor

Brimorak

Canoloth

Chasme

Coloxus

Dretch

Glabrezu

Hezrou

Incubus

Kalavakus

Marilith

Nabasu

Nalfeshnee

Omox

Quasit

Schir

Seraptis

Shadow Demon

Shemhazian

Solamith

Succubus

Vavakia

Vermlek

Vrock

Vrolikai

Rifts Demons
Demon Bat

Demon Fly

Alu

Aquatic

Banshee

Couril

Ghouls and Nasu

Labassu

Lasae

Mares/Nightmare

Shedim

Firethorn

Hang-Jaw Demon Rat

Razoredged Prowler

Savage Fury

Spiked strangler

Bumble Ball

Grave treader

Heckler

Hell's Wrath

Nightwind

Raging Doom

Shimmering Slayer

Brek-Shall

Soul Catcher

Baal-Rog

Gallu

Jinn

Magot

Night Owl

Rakshasa

Skull stealer

Slithering Screamer

Ravenous

Anima Demons
Ignis

Stribog

The Seven Lords of Hell
Lucifer Lord of Pride and Terror

Satan Lord of Wrath and Hate

Leviathan Lord of Envy and Destruction

Mammon Lord of Greed and Sin

Asmodeus Lord of Lust and Anguish

Belphagor Lord of Sloth and Deceit

Beelzebub Lord of Gluttony and Pain

The Seven Evils
Diablo

Baal

Mephisto

Azmodan

Belial

Andariel

Duriel

Role in Ultima
Throughout the multiverse, demons have been summoned as either henchman or advisors for evil people. Many villains still continue to do this.

As for the Organization, which does have demons in it's ranks, is able to field entire armies of demons, giving them a massive advantage over the other factions.