The Brotherhood of Seven
Episode: "The Puppet Show," season one
Unique Attributes: The Brotherhood of Seven (or just "The Seven") took the form of young humans, but could only maintain those forms if they ate fresh human heart and brain every seven years.
Most Monstrous Moment: They ate hearts and brains. What, that's not enough?
Current Status: Over the years, demon-hunter Sid tracked and killed all seven of them in order to free himself from his curse.

Hellmouth Spawn
First Appearance: "Prophecy Girl," season one
Other Episodes: "The Zeppo" season three
Unique Attributes: As pure demons from their dimensions, they are far more powerful-not to mention uglier and slimier-than the average earthbound demons.
Most Monstrous Moment: In both episodes the demons at the other side of the Hellmouth attempted to break through.
Current Status: Beaten backbut waiting.

Machida
Episode: "Reptile Boy," season two
Key Relationship: the fraternity brothers at Crestwood College's Delta Zeta Kappa worshipped Machida for decades.
Unique Attributes: "Machida is half man, half snake. He has a muscular body (from the waist up) and the enlarged and frightening head of a man with the fangs and horrible eyes of a snake. His skin has the diamond pattern of a snake-thus the snake-and a big 'un too, his snake body trails behind him into the depths of the pit. God knows how long it is."
Most Monstrous Moment: Machida ate human females offered as sacrifice by his worshippers.
Current Status: Though Buffy chopped Machida in half at the end of "Reptile Boy," investigators never found his body. It is possible that he managed to survive and still lives somewhere beneath Sunnydale.

Eyghon the Sleepwalker
First Appearance: "the Dark Age," season two
Key Relationship: Eyghon was called up by Rupert Giles, Ethan Rayne, and a group of there friends some two decades ago. In order to return him to his dimension, one of their numbers lost his life. However, they were branded with his mark, making them all targets when he managed to return to this plane, as well as vessels whom it was apparently easier for him to occupy.
Unique Attributes: Eyghon, once called from his dimension, could occupy the bodies of dead or sleeping humans. If he used a dead body as host, energy would be leached from it and it would eventually disintegrate, becoming a pool of strange, mercurial fluid. Eyghon could also track anyone with his mark on his or her flesh. His true appearance is unknown, but given the transformation of Jenny Calendar when the demon possessed her, it can be presumed that Eyghon's true countenance is scaly and somewhat reptilian.
Most Monstrous Moment: He murdered Giles's old acquaintance Philip Henry, among others.
Current Status: Forced out of Jenny Calendar's body, Eyghon attempted to posses Angel, only to find the vampire's body already crowded with a human and a demon soul. Eyghon struggled to get control, but was defeated. It is unknown if Eyghon was destroyed or merely dispatched in his weakened state back to his original dimension.

Norman Pfister
Episodes: "What's My Line? Parts one and two," season two
Key Relationship: Mr.Pfister was a member of the Order of Taraka, a guild of super natural assassins who were hired by Spike to kill the Slayer.
Unique Attributes: Mr. Pfister completely comprises of maggot like bugs and grubs but could appear to be human when those organisms are joined together.
Most Monstrous Moment: Hello? Maggots? (Or door-to-door salesman?)
Current Status: Disassembled into his bug form, Pfister was stomped to death by Cordelia and Xander.

Octarus
Episode: "What's My Line? Part One," season two
Key Relationship: Octarus was a member of the Order of Taraka.
Unique Attributes: Aside from being hideous, at nearly eight feet tall Octarus was a giant. Part of his face was ruined, and he had only one good eye.
Most Monstrous Moment: He attempted to kill Buffy at an ice skating rink where she had gone to relax with Angel.
Current Status: Buffy cut his throat with the blade of one of her skates.

The Judge
First Appearance: "Surprise," season two
Other Episodes: "Innocence," season two
Key Relationship: Though he had once been hacked into pieces and his body parts spread around the world, Spike and Drusilla managed to gather them and put them back together again. He was allied with them during this brief resurrection.
Unique Attributes: With bright blue skin, the Judge was certainly one of the most colorful demons ever seen on Buffy. Any weapon forged by man could not kill him. Also, his touch could burn all the goodness and humanity out of any being he laid hands on.
Most Monstrous Moment: He used his burning touch on Dalton, a vampire lackey of Spike's, simply because the poor fellow liked to read.
Current Status: Buffy blew up the Judge with a rocket launcher in "Innocence." His remaining parts, from big to very tiny, were then scattered to prevent him from being revived once more.

Whistler
Episodes: "Becoming, Parts One and Two," season two
Key Relationship: Though he is a demon, Whistler apparently worked for certain cosmic entities responsible for maintaining the balance between good and evil in the universe. He was briefly a mentor to Angel and, in fact, was the one who brought Buffy to Angel's attention.
Unique Attributes: Whistler looked human, but was not.
Most Monstrous Moment: Every morning while he chose his wardrobe.
Current Status: Whistler was last seen in Sunnydale in "Becoming, Part Two." His current whereabouts are unknown.

Acathla
First Appearance: "Becoming, Parts One and Two," season two
Unique Attributes: Acathla was capable of creating a vortex that would suck all the living things on Earth into the demon dimensions. Centuries ago, he was thwarted by a knight who ran him through. The demon was turned to stone.
Most Monstrous Moment: The whole vortex thing.
Current Status: Though Acathla once again turned to stone at the end of the second season, the current whereabouts of his stone form are unknown.

Ken
Episode: "Anne," season three
Key Relationship: Ken lured young runaways to a shelter, but rather than help them, he transported them through a dimensional gate to a hellish world where they were made slaves.
Unique Attributes: Ken wore a false human face over his true demonic visage.
Most Monstrous Moment: Ken not only worked the slaves until they were old and withered before returning them to our world, but he and his guards spent those years breaking them down and stealing away their individuality, driving them insane.
Current Status: Buffy wounded Ken in battle. When she had led the captives' back through the portal, it closed on Ken's legs, whereupon Buffy decapitated him.

Kulak of the Miquot Clan
Episode: "Homecoming," season three
Unique Attributes: With his bright yellow skin and the fin on his head, Kulak was one of the most unique-looking demons ever to appear on Buffy. He also was able to produce organic blades from his arms, which he used in battle.
Most Monstrous Moment: Kulak was among those assassins who took part in Slayerfest '98, paying for the privilege of participating in that contest to see who could kill Buffy and Faith.
Current Status: Kulak was accidentally blown up in a cabin in Miller's Woods.

The Mayor
First Appearance: "Homecoming," season three
Other Episodes: season three: "Band Candy," "Lover's Walk," "Gingerbread," "Bad Girls," "Consequences," Doppelgangland," "Enemies," "Choices," "Graduation Day, Parts One and Two," season four: "This Year's Girl"
Key Relationship: The Mayor was married to Edna Mae in 1903. She later died. He employed Mr. Trick, also employed Ethan Rayne and others at various times. His most significant relationship of the last few years of his life was with Faith, the renegade Slayer to whom he became a kind of father figure. He cared for her deeply, which was ironic for a being bent on becoming a pure demon and bringing darkness down upon the world.
Unique Attributes: Quirky and germophobic, the Mayor had an antiquated sense of propriety, despite his demon worship and evil aspirations. Thanks to a ritual the Mayor was completely invulnerable for the last hundred days before his Ascension-the moment at which he became a pure demon, something he had been working toward for a century. As a pure demon he was an enormous snakelike creature.
Most Monstrous Moment: There are many to choose from, considering his intentions. When he became a pure demon, for instance, he ate Principal Snyder, who despite being annoying had been a loyal lackey.
Current Status: Snake jerky.

Lurconis
Episode: "Band Candy," season three
Key Relationship: Lurconis was an enormous eel-like demon that resided in the sewers under Sunnydale. As a human hoping to ascend to true demonhood one day, the Mayor worshipped him and offered a tribute every thirty years.
Unique Attributes: Despite its size, Lurconis was lightening-fast.
Most Monstrous Moment: It ate human babies given to it in tribute.
Current Status: Buffy burned Lurconis to death.

Lagos
Episode: "Revelations," season three
Unique Attributes: A tall, warriorlike demon, Lagos wielded an ax and dressed in battle armor.
Current Status: Buffy decapitated Lagos.

Anya (Anyanka)
Episode: "The Wish," season three. Anya appears in almost every episode ever since "The Wish."
Key Relationship: The D'Hoffryn transformed Anya into a vengaence demon many centuries ago. When the amulet that held her powers was destroyed, she became a human again. As a human, she is the girlfriend of Xander Harris.
Unique Attributes: As a demon, and now as a human, Anya has the ability to imagine horribly agonizing and creative methods of death and torture for the males of the species. As a demon, she could appear to be human but also had a monstrous visage.
Most Monstrous Moment: In "The Wish," Anya gave Cordelia Chase her wish-that Buffy Summers had never come to Sunnydale. The town transformed into an alternate reality where vampires ruled. When the amulet that held Anyanka's power was destroyed, all reverted too normal.
Current Status: Anya is fully human, involved with Xander, and a bit skittish around the members of the Initiative, as she is uncertain how they feel about ex-demons.

The First
Episode: "Amends," season three
Key Relationship: The First is literally the first evil to have existed on earth, the precursor to all subsequent forces for darkness in the world.
Unique Attributes: While it is unknown if the First has any tangible form, it can manifest itself as pure energy and is capable of, if not reading minds, at least plucking images and emotions out of one's thoughts. The First can also create illusions including simulacrums of human beings. The limits of its power have not yet been explored.
Most Monstrous Moment: The First attempted to drive Angel to madness so that he would murder Buffy.
Current Status: When its plan was revealed, the First withdrew from Sunnydale. Its current whereabouts are unknown.

Hans and Greta Strauss
Episode: "Gingerbread," season three
Key Relationship: Though actually a single being, this vengeance demon was apparently the inspiration for the Hansel and Gretel story.
Unique Attributes: Hans and Greta were actually two parts of a single vengeance demon that could separate itself and appearance of two young children. It could manipulate and influence human minds.
Most Monstrous Moment: The demon spent centuries moving from village to town and whipping up anti-witch hysteria that led to a multitude of executions over the years.
Current Status: Buffy impaled the combined demon with the very post upon which-thanks to the evil influence-she was nearly burned at the stake for witchcraft.

The Sisterhood of the Jhe
Episode: "The Zeppo," season three
Unique Attributes: Hideous she-demons, the Sisterhood is an apocalypse cut, dedicated to world distraction.
Most Monstrous Moment: They opened the Hellmouth.
Current Status: Several members of the Sisterhood of the Jhe were slain in "The Zeppo." It is not known if others of their number still survive.

Balthazar
Episode: "Bad Girls," season three
Key Relationship: Balthazar had once wielded influence in Sunnydale before being driven out in 1899 by Richard Wilkins. He employed El Eliminati, a sect of Italian vampire swordsmen.
Unique Attributes: Balthazar was extraordinarily obese and pale, and his skin was so dry that it had to be constantly moistened by servants. He had the magical ability to move objects and people by the sheer force of his will.
Most Monstrous Moment: Making his servants bathe his blubbery back.
Current Status: Balthazar was electrocuted by Buffy at the climax of "Bad Girls."

D'Hoffryn
Episode: "Doppelgangland," season three (he shows up in a couple episodes after this one)
Key Relationships: D'Hoffryn is part of a council of demons who can bestow power and immortality upon humans by making them vengeance demons. He once did so for Anya, and in "Something Blue," offered to do so for Willow, who refused.
Unique Attributes: D'Hoffryn apparently has extraordinary powers of magical observation, able to watch earthly goings-on from his own dimension, to and from which he can also transport people.
Most Monstrous Moment: Offering to turn Willow into a vengeance demon.
Current Status: D'Hoffryn is believed to still be in his home dimension, monitoring the progress of the vengeance demons he has created in the past and possible candidates for the future.

Skyler
Episode: "Enemies," season three
Unique Attributes: A sniveling coward, Skyler dressed like a middle-age tourist.
Current Status: Murdered by Faith.

Telepaths
Episode: "Earshot," season three
Key Relationship: With one another.
Unique Attributes: These demons have no mouths and communicate with one another telepathically.
Most Monstrous Moment: When Buffy killed one of the demons and it bled on her, she was infected with its telepathic power until the blood of the second was used to cure her.
Current Status: Buffy killed the first, and Angel later killed the second in order to use its blood for Buffy's cure.

Gavrok Spiders
Episode: "Choices," season three
Key Relationship: There were billions of these creatures in the Box of Gavrok. The Mayor ate a number of them as part of his preparations for his Ascension.
Unique Attributes: The creatures from the Box of Gavrok are not truly spiders but enormous mutant insectoids whose appearance is reminiscent of giant spiders. They kill by tearing off a human's face though it seems likely that there is also some form of venom or suffocation at works as well.
Most Monstrous Moment: See "tearing off people's faces."
Current Status: It is unknown how many spiders remain in the Box of Gavrok, or what the current location of the box is.

Hellhounds
Episode: "The Prom," season three
Key Relationship: Trained by Tucker Wells.
Unique Attributes: Demonic foot soldiers who have the appearance of large savage hounds.
Most Monstrous Moment: They eat brains. Enough said.
Current Status: Buffy killed the four Hellhounds in "The Prom," but others likely exist.

Kathy Newman and Tapparich
First Appearance (Kathy): "The Freshman," season four
Other Episodes (and first appearance of Tapparich): "Living Conditions," season four
Key Relationship: Kathy fled her demon dimension to escape her controlling father, Tapparich. Disguised as a human, she enrolled at UC Sunnydale, and was briefly Buffy Summer's roommate.
Unique Attributes: A self-involved, obsessively neat demon, she has a fondness for bubble-gum pop music.
Most Monstrous Moment: In "Living Conditions," Kathy performed a ritual that drew all the goodness out of Buffy and into herself in hopes that the demons her father sent to bring her home would mistakenly take Buffy instead. (Oh, and she borrowed Buffy's favorite sweater without asking and then spilled ketchup in it!)
Current Status: Tapparich came to Earth and took Kathy back home with him.

Gachnar
Episode: "Fear, Itself," season four
Key Relationship: Gachnar is a Fear Demon.
Unique Attributes: Though hideous and fearsome looking, Gachnar is in reality only a few inches tall. He is capable, however, of rooting through the human psyche for a person's innermost fears and making them manifest in terrifing ways. He is also capable of altering the physical surroundings of an area in which he has been summoned.
Most Monstrous Moment: All of the Halloween decorations at the fraternity party during which Gachnar was summoned were suddenly made real by his power. The peeled grapes meant to look like eyeballs? Yep, them too.
Current Status: Buffy stomped this tiny demon, literally. However it seems that this was only a single manifestation of Gachnar, and the Fear Demon is now in his own dimension, continuing to fulfill his evil function.

Vahrall Demons
Episode: "Doomed," season four
Unique Attributes: Vahrall demons are large, silent creatures with long talons and enourmous strength. They carve their symbol, a styalized eye, upon the flesh of their victims.
Most Monstrous Moment: After collecting the blood of a man (through murder), the bones of a child (through grave robbing) and the Word of Valios (a talisman they brutilalized Giles to aquire), the Vahrall demons attempted to use those items to perform a ritual that would open the Hellmouth.
Current Status: After one of the demons managed to leap into the breached hellmouth, and a second was thrown into it by Spike, Buffy managed to go in and bring back the third, and then killed it. By doing so, she prevented their ritual from being completed, and the Hellmouth remained closed.

Rupert Giles (as a demon)
Episode (as a demon): "A New Man," season four
Key Relationship (as a demon): Giles's old friend (and current enemy), the sorcerer Ethan Rayne, used a spell to transform him into a Fyarl demon. During this period, he was unable to speak english and was hunted by those closest to him. Spike, unfortunately, was able to speak Fyarl, but Giles had to pay him for assisstance.
Unique Attributes (as a demon): As a Fyarl, Giles was incredibly stong and had the ability to shoot jets of paralizing mucus from his nostrils. He had enormous curling horns and yellow-tinged skin.
Most Monstrous Moment (as a demon): While in demon form, Giles used his new appearance to frighten Maggie Walsh, just for laughs (okay, maybe not so monstrous).
Current Status (as a demon): When Buffy realized the Fyarl demon was Giles, they forced Ethan to return Giles to his human form.

Polgara Demons
Episode: "The I in Team," season four
Unique Attributes: The towering demon has a huge, distorted cranium. Like all those of its species, it had long bone skewers that jutted from its forearms during the battle.
Current Status: The Initiative captured the Polgara alive in "The I in Team." However, Maggie Walsh and Dr. Anlgeman (of the Initiative) killed it so they could cut off one of its arms to attach it to their pet project, the patchwork monster called Adam.