Name: KAKISTOS
Status: Vampire, Deceased
Traits/Powers: Very Old, hands that are cloven hooves.
First Appearance: "Faith, Hope And Truck"
Show: Buffy The Vampire Slayer
Other Info: His name is Greek for "the worst of the worst". Kakistos is a vampire who is so old that his hands have turned into cloven hooves.

Name: KEN
Status: Demon, Deceased
Traits/Powers: None
First Appearance: "Anne"
Show: Buffy The Vampire Slayer
Other Info: In the episode 'Anne' Ken was a demon who used the weak homeless for slave labor.

Name: KUNGAI DEMON
Status: Demon
Traits/Powers: Horn can consume one's life force
First Appearance: "Parting Gifts"
Show: Angel
Other Info: 

Name: KULAK, OF THE MIQUOT CLAN
Status: Demon, Deceased
Traits/Powers: Bone Skewers appear from his arms.
First Appearance: "Homecoming"
Show: Buffy The Vampire Slayer
Other Info: Participated in "Slayerfest 98"