King's favorite authors are horror writers James Herbert and Stephen King.
King smokes Prince brand cigarettes, imported from his home country of Denmark, to his residence in Dallas.
King is an avid coffee drinker, saying he can't live without it.
King seldom takes vacations, his last one was to Jamaica in 1993.
King has a pet black cat named "Magic."
King first played guitar with the group Brainstorm before shifting to vocals when asked to write song material for the group Bratz.
King says his primary inspiration for his stage act and makeup was 1970s shock-rocker Alice Cooper.
King used a human skull he nicknamed "Melissa" as a prop at his concets in the early 1980s until it was stolen at a performance in Copenhagen. He claims the skull belonged to a witch that was burned at the stake and also named an album he recorded with his group Mercyful Fate after it as well.
King's songs "Welcome Home" and "The Invisible Guests" were used in Clerks II (2006).
King is the frontman of two musical groups, Mercyful Fate and King Diamond, his solo group formed after leaving Mercyful Fate in 1985. King later reunited Mercyful Fate in 1995, and has recorded albums for both groups since 1995.
King said the inspiration for his album Abigail (1987) came from a dream.
King's official site for fans is at covenworldwide.org.
King's albums are written with each song being a part of a whole story, rather than random singles.
King uses a microphone stand made of two femur bones in the shape of a cross.
King changed his stage makeup after a lawsuit from Gene Simmons of KISS claimed King's design of a heraldic cross coupled with an upside down cross on his forehead was too similar to Gene's Kabuki-style makeup.
King created a special DVD movie to accompany his release of his album "The Puppet Master" in 2003.
King is 6 feet 3 inches tall.