I dont know any of them but....
Wesley Wyndham-Price was a character who appeared rather briefly in the third season of Buffy the Vampire Slayer
before becoming a permenant cast member on Angel
for about four-and-a-half of its five seasons. For a short time he deemed himself to be a rogue demon hunter, but dropped the moniker when he tired of trying to answer the question, "What's a rogue demon?"
Sid the Dummy was, apparently, a master demon hunter who was cursed and turned into a ventrilloquist dummy. That's about all there is to say about him since he appeared in only a single episode of Buffy
and, for some reason, in the Chaos Bleeds
Taki has appeared in every game from the Soul Edge / Soul Calibur
series where her goal is ostensibly to slay the demon residing in the cursed sword wielded first by Cevantes, then by Nightmare. Considering that Soul Calibur III
is in production, I'd say she's doing a pretty piss poor job of it.
Raikoh is the protagonist of the Otogi
series for the XBox. He's technically dead, but that does little to deter him from dying some more whenever I pick up the controller. I *guess* he's fairly successful demon hunter, but frankly, he's also a big bore.
Illidan Stormrage appears during the Night Elf campaign of WarCraft III.
He's blind and has some issues with abandonment and anger management, but if you need someone willing to single-handedly face down a horde of rampaging demons on the battlefield, he's probably your man.
Ellen Pompeo is the lead actress on Grey's Anatomy
where, in addition to practicing medicine and screwing her boss, she helps her patients and her friends to conquer their inner demons through an intricate regimen of friendly advice and self-serving pity parties.
The Grue are the race of nocturnal demons who prowl the pitch blackness in the Zork
games. No one has ever seen one as the light seems to keep them at bay, but woe unto the adventurer whose lantern goes out for a prowling Grue can sweep out of the darkness in absolute silence and take him in a single snap of its jaws.