The villainous characters are listed here in alphabetical order by their first name,
or the name of the demon. The episode they appeared in is listed beside each name.

Allen Lloyd (Episode: "Sense and Sensitivity")

Angelbeast (Episode: "Through the Looking Glass")

Angelus (Episode: "Eternity")

Angel and Boone (Episode: "Blood Money")

Aunt Helen (Episode: "Happy Anniversary")

Barney (Episode: "Parting Gifts")

Bethany Chaulk (Episode: "Untouched")

Captain (Episode: "There's No Place Like Plrtz Glrb")

Constable (Episode: "Over the Rainbow")

Darin and Jack Macnamara (Episode: "The Ring")

Darla (First Episode: "First Impressions")

Deevak (Episode: "First Impressions")

Director (Episode: "Belonging")

Doug Sanders (Episode: "Disharmony")

Drokken Demon (Episode: "Belonging")

Drusilla (First Episode: "The Trial")

Ethros Demon (Episode: "I've Got You Under My Skin")

Faith (Episode: "Five By Five")

Gene Rainy (Episode: "Happy Anniversary")

Griff (Episode: "Rm W/A Vu")

Harmony (Episode: "Disharmony")

Haxil Beast (Episode: "Expecting")

Head Demon Guy (Episode: "The Prodigal")

Jheira (Episode: "She")

Knox (Episode: "War Zone")

Kwaini Demon (Episode: "The Prodigal")

Lenny (abusive boyfriend) (Episode: "In The Dark")

Lenny Edwards (Episode: "War Zone")

Lindsey (Episode: "Epiphany")

Lubber Demons (Episode: "Happy Anniversary")

Magnus Bryce (Episode: "Guise Will Be Guise")

Marcus (Episode: "In The Dark")

Maude Pearson (Episode: "Rm W/A Vu")

Mohra Demon (Episode: "I Will Remember You")

Oliver (Episode: "City Of", "Eternity")

Penn (Episode: "Somnambulist")

Rebecca Lowell (Episode: "Eternity")

Ronald Miltzer (Episode: "I Fall To Pieces")

Richard Straley (Episode: "The Bachelor Party")

Russell Winters (Episode: "City Of")

Ryan Anderson (Episode: "I've Got You Under My Skin")

The Scourge (Episode: "Hero")

Silas (First Episode: "Through the Looking Glass")

Skilosh Demons (Episode: "Epiphany")

Spike (Episode: "In The Dark")

Talamour (Episode: "Lonely Hearts")

Thesulac (Episode: "Are You Now or Have You Ever Been")

Thieves (Episode: "The Shroud of Rahmon")

Tony Papazian (Episode: "Sense and Sensitivity")

The Tribunal (Episode: "Judgment")

Turfog (Episode: "Dear Boy")

Valkma (Episode: "Over the Rainbow")

Vampires (Episode: "Darla")

Vanessa (Episode: "Blind Date")

Vigories of Oden Tal (Episode "She")

Vocah (Episode: "To Shanshu in LA")

Watcher's Council Special Operations ("Five By Five")

Wilson Christopher (Episode: "Expecting")

Wolfram and Hart (First Episode: "City Of")

Zombie Cops (Episode: "The Thin Dead Line")