fictional demons

A
Alastair (Supernatural TV series)
Alichino (Dante's Divina Commedia)
Artery (Shan's The Demonata)
Asura from Soul Eater.
Azal (Doctor Who TV series)
Azazel (Supernatural TV series)
Andariel (Diablo series)
B
Baal (Diablo series)
Overlord Baal, the Tyrant of Terror from multiple Nippon Ichi titles
Balthazar (Constantine)
Baphomet (Doom video game series)
Barbariccia (Dante's Divina Commedia)
Barbas (Charmed TV series)
Bartimaeus (Stroud's Bartimaeus Trilogy)
Be'lakor (Warhammer Fantasy deamonology)
Belfagor (Machiavelli's Belfagor arcidiavolo)
Belthazor (Charmed TV series)
Blackheart (Marvel Comics)

C
Cadaver (Shan's The Demonata)
Cagnazzo (Dante's Divina Commedia)
Calcabrina (Dante's Divina Commedia)
Calcifer (Howl's Moving Castle)
Castor (Stroud's Bartimaeus Trilogy)
Chernabog (Disney's Fantasia (film))
Ciriatto (Dante's Divina Commedia)
Crowley (Gaiman and Prachett' Good Omens)
Cyberdemon (Doom video game series)

D
Devi Devi (Panyo Panyo Di Gi Charat)
Diablo (Diablo series)
Doyle Angel the series)
Duriel (Diablo series)
Draghinazzo (Dante's Divina Commedia)
Dan Sethos (Darkness Within)

E
Errtu (Literature, R.A. Salvatore)
Etrigan (DC Comics)


F
Farfarello (Dante's Divina Commedia)
Faquarl (Stroud's Bartimaeus Trilogy)
Femur (Shan's The Demonata)

G
The title characters from the Ghoulies film series.

H
Hastur (from the Cthulhu Mythos and Neil Gaiman and Terry Prachett's Good Omens)
Hell Knight (Doom video game series)
Him (The Powerpuff Girls)
Hellboy

G
Gothmog (J.R.R Tolkien' The Silmarillion)
I
Inferno (Marvel Comics)

J
Jabor (Stroud's Bartimaeus Trilogy)
Jennifer Check (from the 2009 horror film, Jennifer's Body)
Juiblex (Dungeons & Dragons role-playing game)

K
Korrok (David Wong's John Dies at the End novel)
Kronos (In Nomine role-playing game)

L
Libicocco (Dante's Divina Commedia)
Ligur in (Gaiman and Prachett' Good Omens)
Laharl from Disgaea
Lord Loss (Shan's The Demonata)
Lorne_Angel (Angel the series)
Lilith (Supernatural)
Lamia (Drag Me to Hell)
Lucia and Lilith (Darkness Within)

M
Malacoda (Dante's Divina Commedia)
Maledict (Doom 3: Resurrection of Evil)
Malfegor (Magic: The Gathering)
Meg Masters (Supernatural TV series)
Mephisto (Marvel Comics)
Mephisto (Diablo series)

N
N°1 (Colfer's Artemis Fowl)
Nouda (Stroud's Bartimaeus Trilogy)
N'zall ( also see Abbot) Colfer's Artemis Fowl)
Neuro Nōgami from Majin Tantei Nōgami Neuro (Manga and Anime series)
Nicole Richards (Darkness Within)

O
The Old Ones from Anthony Horowitz's Power of Five book series.

P
Piccolo Daimao (Dragon Ball)
Pennywise the Dancing Clown (Stephen King's It)
Pazuzu (William Blatty's The Exorcist)

Q
Queezle (Stroud's Bartimaeus Trilogy)
Qwan (Colfer's Artemis Fowl)
Qweffor (Colfer's Artemis Fowl)

R
Rakdos (Magic: the Gathering)
Red Guy (Cow and Chicken)
Ramuthra (Stroud's Bartimaeus Trilogy)
Rubicante (Dante's Divina Commedia)
Ruby (Supernatural)
Roger Regorris (Darkness Within)

S
Scarmiglione (Dante's Divina Commedia)
Screwtape (C.S.Lewis The Screwtape Letters)
Sebastian Michaels (Kuroshitsuji manga and anime series)
The Seer (Charmed TV series)
Shax (Charmed TV series)
The Source of All Evil (Charmed TV series)
Sparda (Hideki Kamiya's Devil May Cry video game series)
Seth (A Haunting)

T
Turok-Han (Buffy the vampire Slayer)
Trigon (DC Comics)

U
Ungoliant (from The Silmarillion)

V
Vein (Shan's The Demonata)
Vyers "Mid-Boss" from Disgaea
Violator from Image Comics

W
Wormwood (C.S. Lewis The Screwtape Letters)


X

Y

Z
Zankou (Charmed TV series)