Adventure Dennis: The demons come in a variety of shapes and sizes and apparently live in Demonsylvania, ruled by King Demonevil. They kidnap the mayor because of his battery disposal policies.
Ava's Demon Wrathia is a horned woman who became Ava's demon after choosing to use My Death Is Just the Beginning alongside her strongest warriors in order for them all to gain reinforcements in the form of their new hosts.
#Blessed: Daeriel is a daemon and the Goddess of the Underworld. She is also the Goddess of Chaos.
Charby the Vampirate: The demons are varied and plentiful and have nothing in common with Fallen Angels and no relation to Hell. Samrick, the demon king, is a giant red horned sizeshifter with access to powerful magic, the scotodino are horned humanoids of varied sizes with black facial markings and bat wings who are from another dimension, while the orycalopes look like pale humans with bunny ears and no pupils. Demons have a reputation among those without fiendish blood for being violent and dangerous but while they may have violent impulses they can control them, and adult male orycalopes in particular are very mild people.
Chirault: "Demon" is apparently a blanket term for a lot of different dangerous (or not) creatures. These include horned humanoids (like the protagonist, Kiran), cat girls (called Kyrions), emaciated frog-monsters, and titans made of mud and tentacles. Some of these are intelligent, and some aren't.
Court of Roses: Nocturne is an infernal, though he is reserved, cultured, polite, and pointedly un-demonic in disposition.
Daughter of the Lilies: "Drath" or "Drackthmal" is an umbrella term that comprises both damned souls and demons that can be summoned from The Underworld by having them possess living being, as perWord of God.
Demon Eater: The demons are cannibals and only transform after they eat.
Demon King :They're pure evil spirits who come from Hell. The average rabble are apparently derived from the souks of the damned, while their leadership, the Lords of Hell, are fallen angels and are mostly based on figures from the ArsGoetia. They can possess people, are weak to silver and iron, and can produce hybrids with humans known as "man-devils"
Demonology 101 has demons that walk among people, but have pointy ears and teeth.
The Dragon Doctors: The demons come in a rainbow of shapes and sizes. Some threaten people by manipulating their emotions, but the most insidious ones verge on transcending their medium to attack their victims on a metaphysical level.
Drowtales: Demons are actually creatures from other dimensions that don't have a physical form (and usually appear as floating red lights or black shadows with eyes) until they latch on to the aura of a victim and eventually take over their body. Some of them like Khaless or Umpus are intelligent, and can pass off as full fledged members of their masters' clans. Most of them however are just animals that attack anything they see without a summoner to direct them.
The Fan: Demons are psychic parasites that are formed as a result of powerful negative emotions in the minds of individuals with sufficient magical or psychic energy. They usually grow larger as they feed off these energies and eventually take over the host. Demons can be enslaved and called in using summoning magic. So far, their only weakness seems to be an enchanted camera that can trap and banish them.
Friendly Hostility: The Demon used to live in Fox and Collin's refrigerator. Not only is he not evil, he works as a nurse!
Goblins: Demons are ancient entities from the deepest depths of reality (read: Hell) who are able to gain sustenance by inflicting suffering on the souls of other beings. They used to acquire suffering to consume by invading the realm of the gods and choosing some lesser divine entity to wage war against; when mortals came along, demons found them less satisfying as a meal, but the fact that they were plentiful and easier to subdue means many demons have switched to preying on them instead (the author has compared this to a bear raiding trashcans in a suburban area). The concept of a Deal with the Devil arose because a demon who can acquire ownership of a mortal soul can torture it for the rest of existence, providing an infinite source of food. However, only the most powerful demons are able to take souls by force; most have to persuade a mortal to part with it willingly.
Reynardine is a talking mythological fox who gained body-snatching powers and subsequently lost his original body. Now he exists as some kind of fiery fox spirit that can't survive outside other people's bodies, which stinks for everyone else because he invariably kills his host. (This seems to be the sole reason why Sir Eglamore calls him a demon.) His cousin is a Trickster-god.
Zimmy, unkempt and nasty girl with freakyred eyes covered by black goo, was called a demon by Reynardine (who avoids touching her). Tom confirmed, though, that she's a human and it was just an invective in this case. Though it seems pretty clear that human as though she may be, Zimmy isn't just a human.
It seems that in Gunnerkrigg Court "demon" is simply a pejorative used by people of ethereal beings that are dangerous, or that they simply don't like. Renard doesn't identify himself as demon, nor does anyone who befriends him. Likewise, he's prone of accusing Zimmy of being a demon, but no-one else agrees.
Hell(p): Demons are Hell's government and look pretty human save for occasional horns, tails, and wings. Although in this world, anyone can have those and more. People generally dislike and distrust them, but some think they aren't all bad. Confirmed when one demon joins the team of human protagonists.
Homestuck: The comic never defines what a "demon" is, but the term is frequently used to describe powerful, evil and destructive beings.
Lord English, an immortal time-traveling mob boss who can only enter a universe upon its destruction, is often called a demon. He's demonic in the sense of being an evil, hideous, and violent monster opposed to all goodness, but he looks mainly like a burly, skull-headed, green humanoid. However, the later acts of the comic reveal that he's a Cherub, a race of beings that normally play an important role in stabilizing universes, that's become twisted, maladjusted, and driven towards pointless, absolute destruction.
Another being referred to as a "demon" is the fully-prototyped Jack Noir, a pitch black Winged Humanoid that calls to mind a Fallen Angel.
Aradia's ancestor, the Handmaid (post-scratch Damara), a time-traveling agent of chaos responsible for turning Alternia into a Crapsack World, is often referred to by Doc Scratch as a "demoness".
Housepets!: A Demon is one half of a soul split upon death, comprised of said soul's evil thoughts and vices. When a demon incarnates in the Bad Place, they lose all memory of their mortal lives and are put to work doing... Something.
Kill Six Billion Demons: Devils come from the Void, an ashen wasteland between the worlds of the multiverse, where they were all previously banished by the gods as the Hot Black Flame, a formless chaos. Humans and Demiurges gave the devils form by naming them individually and bestowing upon them masks, allowing them entry into Throne. They are "born" with a large number of names and spend their lives seeking to reduce this number, usually by means of tricking mortals into helping them along. They come in six kinds, based on how many names they have shorn off, which changes the color of their mask:
Pale devils, mute and insectlike, have the most names. They generally seem to do simple labor for other devils. They have grey fur and multiple arms, and their mask is the least humanoid, with no mouth or features save a number of randomly-arranged eyeholes.
Blue devils are small and imp-like, with tall, straight horns. They apparently tend towards kleptomania and are fond of vice and liquor.
Red devils have large horns and tend to be very hairy. They are the most aggressive and warlike, often summoned and bound to act as enforcers, warriors and guards, which they'll gladly do in exchange for alcohol and trinkets until they find a loophole in their contract and dismember their summoner.
Green devils have skull-like masks, resemble reptiles and are often winged. They are slow and sluggish in their movements, something that belies a thoughtful and manipulative nature. They deal in secrets and are skilled liars.
Gold devils have creepily human-like masks and dress in rags or finery. They are extremely intelligent and have perfect memories, coupled with a great love of wealth and a profound sense of malice. They are the most dangerous devil one is likely to encounter, and attempting to bind them is extremely inadvisable.
Finally, Ebon devils have managed to shear off all their names but one, their "black" name. They are very wily and very dangerous, even more so than Gold devils, and there are only a few dozen in the entire multiverse.
There's also the King of the Devils, simply named Himself. Little to nothing is known of him, but he seems to be an exception of sorts from the normal devil ranking system. And, seeing devils naming themselves is supposed to be completely impossible, an exception of sorts fromeverything else, making him at odds with the universe's laws and rules.
Kismetropolis: Demons are of the fallen angel variety.
Kubera: The sura are pretty obviously demons, being powerful supernatural creatures of varying strength that oppose the gods. The most powerful sura, the Nastika, are basically demon gods—they're actually more powerful than the gods, the difference is that the gods can resurrect themselves infinitely, while the Nastika only get to live once.
My Best Friend Marneao: The Inferni citizens. The demons in the comic are hornedhumanoid monsters, with sharp teeths and red eyes, and a specific kind of super power, while other Inferni residents like Marneao, Lucifer and Miltch are human looking red devils with the classical horns and tail. The Inferni are slaves to Heaven after the new God ascension, and are not allowed to kill humans, and their home is not that bad compared with the elitist Heaven city, which is constantly attacked by abominations. In inferni, people can have a second chance, and demons and humans can have a relationship. The demons that attack our protagonist are also not really bad guys, just employers doing their job.
In My Impossible Soulmate, Demons are corrupted humans/demi-humans. How the corruption affects their appearance varies from person to person. Most of these alterations often involve a change in their eyes/hair/skin color or their height. Demon demi-humans also retain animal features they had prior to the corruption. For example, a demon nereid would still have Ear Fins. A person is changed into a demon by having a new demonic name carved into them, after which they can never say their original name again, and even answering to it can kill them. They're physically powerful and can live up to 140 years old, but as a cost of the transformation, they lose all of their magical ability.
The Order of the Stick is based on the Dungeons & Dragons rules, but gives it a little twist. The main fiendish character is Sabine, and debate still rages over whether she is a demon or a devil (see Tabletop Games above for the distinction). Haley couldn't tell which type of arrow (silver for devils, cold iron for demons) would penetrate her Damage Reduction, so she used both, and still isn't sure which one worked. OOTS also features the Inter-Fiend Cooperation Commission, an experimental alliance between Demons, Devils and Daemons, who seek to prove that the three factions can achieve more together than apart. Sabine (and now Qarr, who at least is definitely a devil) works for them, further obscuring the issue of what side she is actually on. As for why no one can tell what Sabine is, both demons and devils feature attractive, winged, female creatures. Sabine most closely resembles a demonic succubus (she can shapeshift, drains life force, and describes herself as an "incarnation of illicit sex") rather than a devilish erinyes. However, she was sent to be the concubine of the explicitly lawful Nale. The revelation that she works for the IFCC might finally be an explanation for this, as it would give a reason for a chaotic being to be serving lawful interests.
In Planes of Eldlor, an army of demons are lurking just on the other side of the rift, a gateway to their realm.
E-Z and Gearhead from Powernap certainly look and act the part, although quite what they are, remains to be established
Devil Girls in Sinfest are created by being "bomfed" (no, this is not an Unusual Euphemism, it's more of a sound effect) by Satan. There are also other devils who may have been bomfed or may have been born that way.
Blue at least appears to at one time have been a non-Devil girl in "Divinity School" with a young Jesus ... possibly an angel-in-training who was later tempted/corrupted by "bad boy" the young Devil. Young Blue has neither horns nor a tail.
Some of the demons in Sluggy Freelance come from the Dimension of Pain. Others can be summoned through the Book of E-Ville. Although it was implied the demons of the Dimension of Pain are less traditional demons and more like sentient creatures (human or otherwise) transformed by magic and a powerful mutagenic compound. The Demon King may be the only true demon in the entire dimension.
unDivine gives us Esther, a conventional-enough demon summoned by a high school student. Esther shows various demon attributes including shape-shifting, disguise and deception (she can also persuade people of what she wants them to see by holding their hand, and has a sort of limited, contact-only telepathy or mid-reading). Esther has been rescued from some sort of magical prison, by an ill-advised summoning experiment. The school, and the Church which it supports, are a sort of not-really-Catholic deal. Most of the time, she appears as a European-looking blonde, about 6’6” tall. She claims to be helping Del Torres, the student, although quite how is Far from clear. She needs his help in some so-far, unspecified way for some unspecified purpose.
Buwaro from Slightly Damned has GOT to be the worst demon ever. The only danger of dying with him around is death by hugs. Unless, of course, you take his star pendent off.
In Sombulus, the bat-winged Demshul are considered 'demons' by their angelic counterparts for their use of essence manipulation magic, which violates the laws of God. Despite this, they seem to have no collective evil motives.
In Wapsi Square, demons live in a separate world outside of our time line, attach themselves to sentient host creatures, and act in an advisory role. Most people can't see them directly, and they just seem to be a voice in the back of their heads. However, people can become living doorways to the demon realm, allowing them to see and speak to demons directly, and communicate with demons that aren't their own. In addition, if such a person dies under traumatic circumstances, such as a car accident, the demons can take control of the dead body, and continue to live without the host. They usually follow Blue-and-Orange Morality, but they do have a very strict set of rules.
Darumatha is a classic Miltonian demon in many ways, announcing itself from the start as "The Demon-Dragon of Broken Hours," proclaiming its desire to overthrow the existing pantheon and rule the cosmos in turn, and tempting mortals to do its bidding with offers of unlimited power, glory, and treasure and/or Hannibal Lectures. It is also a shapeshifting entity bound from of old by the elder gods, whose default form is a world-spanning metal (yes, metal) serpent and whose preferred alternate form is that of a beautiful young woman. Despite having many good points to make about authority, righteousness and power, Darumatha has turned out to be definitely Evil. However, the difference between it and "the gods" is not so much a category one as a matter of metaphysical history being written by the victors, as the former ruling god and his angels were pretty horrible people themselves.
People tend to call any magical and/or dangerous thing a "demon" as well, such as shapeshifters, but this is not as careless usage as it first seems, since the lines are a lot blurrier than in Western mythology: anyone or anything can ascend to a "higher" level of being, given enough willpower, ambition, ability or training, and in theory become a demon/god if not defeated first. It's not easy, and it's not as if there are scads of ascending supernaturals around, but as in Eastern lore, it's possible: not all supernatural beings are the direct and deliberate creation of a deity.
The demons of Wildlife can be summoned and bargained with, but they are notorious tricksters and fond of using the Exact Words of a contract to trip people up. Taking a contract with them and failing to keep your end of the bargain generally means forfeiting your soul to them.
In Yokoka's Quest, the people of Cisum were first called "demons" by the humans who wandered in, and the name stuck. There's nothing traditionally demonic about them.
Zebra Girl: The whole plot revolves around the accidental transformation of the title character from a normal girl into a demon, complete with hooves, bat wings, prehensile tail and pyrokinesis. It's a lot less fun for her than it sounds.
Zoophobia enjoys and invokes this trope heavily. To name just a few, Damian◊, Zill◊, these◊ and these◊ characters are all classified as demons, or at least half-demon. Yes, really.
And also the many, intricate and diverse classifications of demons.
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