Age: 55 (at time of death)
Height: 1.83m/72 in
Weight: 95kg/210 lbs
Race: Mercurian
Blood Type: A- (at time of death)
Planet: Mercury
Power: Mercury Ice Fire
Birthplace: Mercury
Note: King Mercury is the motovational leader of the Star Guardians. He is the one who trains them in their respective arts.
Story: King Mercury exists only in the eyesights of the Sailor Scouts and Star Guardians. King Mercury is a ghost who serves as a mentor and a guardian, sort of like Luna, Artemis, and Queen Serenity originally did for the Sailor Scouts. King Mercury, along with Darien's father, King Endymion, is the original Star Guardian, and he finds Damien and helps him cultivate his secret past.
King Mercury is a father figure to the Star Guardians, and he proves that by playing matchmaker with the Guardians and the Scouts. His words of wisdom echoes in the ears and hearts of every member who hears them, and they serve as a form of guidance.
His other purpose outside of being a mentor is to have the ability to replace Prince Damien, a purpose he uses later on in their adventures when Prince Damien is preoccupied. He is skilled in each and every martial art form known to man, and even a few that were prevalent only in the Mercury Kingdom. He proves to be an important asset all the way to the end.