She is an extraterrestrial being of pure dark purple energy
Queen Metaria (sometimes referred to as Queen Metalia) appears as a dark shadow creature with green eyes and red mouth and a bright reddish purple diamond-shaped object on the forehead. Feeds on human energy. She wants the Silver Crystal. Those who work for the Dark Kingdom serve her. She was sealed away by the Moon Kingdom until Queen Beryl released her. She is a monster that devours the life energy of all the creatures on the planet. She generates darkness and turns everything into stone. The mark on her forehead is her core and the key to her destruction.
The Inner Senshi try to stop Queen Metalia by using their transformation pens, but they lose their powers. Queen Metalia is destroyed by Sailor Moon with the help of the Silver Crystal, Tuxedo Mask, the Sacred sword and the other Inner Senshi.
Queen Metaria is portrayed as just an amorphous energy being.
Supreme ruler of the Dark Kingdom
D Point at the North pole