Queen Metalia

クイン・メタリア

Queen Metaria is a malignant, amorphous energy entity, akin to the depersonalized Japanese deity of evil, Amatsu-Mikaboshi. She originated from solar radioactivity and serves as the true mastermind behind the Dark Kingdom. Like all arch-villains in the Sailor Moon manga, she is an incarnation of the ultimate antagonist, Chaos. Her name is occasionally romanized as Metallia, though later manga editions adopted the author's preferred spelling, Metaria. In the anime, she is known as Metalia.
In the manga, as Prince Endymion and Princess Serenity prepared for their wedding, Metaria exploited those on Earth who resented the union. Beryl was one such individual, whose affection for Endymion was manipulated by Metaria. Following the war, Metaria was sealed at the North Pole and placed in suspended animation.
During the 20th century, Metaria succeeded in returning a reborn Beryl to her service, ordering her to locate the Silver Crystal to facilitate Metaria's release. After capturing Endymion's reincarnated form, Metaria entered the young man's body to use him as a suitable host, allowing Beryl to die in battle. Once Sailor Moon was compelled to kill Endymion, Metaria was freed to resume her evil deeds. She is ultimately destroyed by Sailor Moon.
In the anime, Metaria remains largely the same, with a few exceptions. She eventually grows powerful enough to resurrect herself and then possesses the dying Beryl, transforming into a towering, goddess-like creature.
In the English dub of the anime, she is referred to solely as the Negaforce, a portmanteau of Negative and Force. This dark lord (or lady) is a god/demon-like entity to the inhabitants of the Negaverse. Although she is the supreme being of her dimension and thus not subordinate to any being from the human dimension, not even Chaos, her role is significantly minimized. Unlike Metaria, she appears never to have been sealed away and seems to have always been a faceless diabolic force, content to let Beryl perform the actual work.