How about warlocks and witches:

A
Adria (comics)
Amatsu-Mikaboshi (character)
Ancient One
Arabian Knight (Marvel Comics)
B
Eli Bard
Belasco (Marvel Comics)
Black Crow (comics)
Black Knight (Dane Whitman)
Black Talon (comics)
Black Widow (Claire Voyant)
Elsa Bloodstone
Ulysses Bloodstone
Brother Voodoo
Brothers Grimm (comics)
C
Calypso (comics)
Captain Britain
Centurious
Chondu the Mystic
Clea
D
Dakimh the Enchanter
Devil-Slayer
Diablo (Marvel Comics)
Dire Wraith
Doctor Strange
Doom 2099
Doctor Doom
Dormammu
Doctor Druid
E
Enchanters Three
Enchantress (Marvel Comics)
F
Forge (comics)
Frigga (comics)
G
Kulan Gath
H
Agatha Harkness
Hela (comics)
Daimon Hellstrom
Hybrid (Jimmy Marks)
K
Kaecilius
Jennifer Kale
Kaluu
Karnilla
Master Khan
Krugarr
L
Lilith (Marvel Comics)
Lionheart (comics)
Loki (comics)
Lorelei (Asgardian)
Lunatik
M
Magik (Illyana Rasputina)
Malekith the Accursed
Margali Szardos
Master Pandemonium
Nico Minoru
Mister Jip
Mister Rasputin
Modred the Mystic
Mojo (comics)
Moondark
Baron Mordo
Morgan le Fay (Marvel Comics)
N
N'Kantu, the Living Mummy
Naga (Marvel Comics)
Necrom
Nekra
Nemesis (Alpha Flight)
O
Odin (character)
P
Pestilence (comics)
Pixie (X-Men)
R
Rintrah (comics)
Roma (comics)
S
Salem's Seven
Satana (Marvel Comics)
Scarlet Witch
Nicholas Scratch
Amanda Sefton
Selene (comics)
Shaman (comics)
Spider-X
Spiral (comics)
Stygyro
Surtur (Marvel Comics)
T
Tai (comics)
Talisman (Alpha Flight)
Tigra
Topaz (Marvel Comics)
U
Umar (Marvel Comics)
Urthona (comics)
V
Cynthia Von Doom
W
Adam Warlock
Wiccan (comics)
Witches (Marvel Comics)
Witchfire (Marvel Comics)
Z
Zeus (Marvel Comics)