Name: MACHIDA
Status: Demon, Deceased
Traits/Powers: Half Man Half Snake
First Appearance: "Reptile Boy"
Show: Buffy The Vampire Slayer
Other Info: In the basement of a long-standing fraternity house in Sunnydale, a secret lurks. Machida, a huge snake-demon, arises each year and is appeased by the sacrifice of three young women. The women are lured there by members of the fraternity, who gain power and rewards from the demon for their evil work.

Name: THE MASTER
Status: The most powerful of all Vampires.
Traits/Powers: Powerful
First Appearance: "Welcome To The Hellmouth"
Show: Buffy The Vampire Slayer
Other Info: Trapped in a sort of dimensional prison, he was unable to enter our world, only able to act through his minions. With the help of these vampire followers, he was able
to cross over to our world briefly by luring Buffy to his lair and biting her. Fortunately, Buffy wasn't dead and suprised the Master, impaling him. His minions, led by the Anointed One, tried to resurrect him using human sacrifice, but were foiled by Buffy, who then smashed the Master's bones to bits. The Master is gone forever. 

Name: MAYOR WILKINS 
Status: Demon, Deceased 
Traits/Powers: Turned Into A Olvocan Pure Demon
First Appearance: "Band Candy"
Show: Buffy The Vampire Slayer
Other Info: The mayor is the original founder of Sunnydale. He wanted to "Ascend" and become a demon (below).

Name: DR. RONALD MELTZER 
Status: Human, Deceased
Traits/Powers: He possessed the power to psychically remove body parts and re connect them using psychic surgery.
First Appearance: "I Fall To Pieces"
Show: Angel
Other Info: He performed eye surgery. When he got too attached to a patient and started stalking her Angel had to help her. 

Name: MINDREADERS 
Status: Humans
Traits/Powers: Able to read minds
First Appearance: "Blind Date"
Show: Angel
Other Info: Also knows as Psychics.

Name: MOLOCH
Status: Demon, Deceased
Traits/Powers: Moloch is a demon fond of charming his victims into believing he is their friend, using them to do his bidding, then killing them.
First Appearance: "I Robot, You Jane"
Show: Buffy The Vampire Slayer
Other Info: Imprisoned magically in an ancient book,  When the book was scanned into the Sunnydale High computer, Moloch escaped onto the internet and then built himself a robotic body, which Buffy defeated.