Queen Metaria is portrayed as just an amorphous energy being in both the manga and the anime. However, in the manga, she takes on a more humanoid appearance as like a shadowed human body. As she gets more powerful, she begins to spread around the world, like a dark cloud. However, her "heart" is located above her eyes, and the mark becomes more prominent as she becomes bigger.
Dark Kingdom Arc
In the manga, Metaria was born from abnormal activity in the sun. She landed on Earth and corrupted a young woman, a sorceress named Beryl. Beryl was secretly in love with the Prince of the Earth, Prince Endymion, who was in love with the moon princess, Princess Serenity, who Beryl became obsessively jealous of. She agreed to work for Metaria to destroy the Moon Kingdom on the premise that she would be able to make Endymion love her. Beryl's possession led to a revolt against the Moon Kingdom. With Metaria's influence, she was even able to corrupt the Shitennou, Endymion's guardians, and launched an attack on the moon. The Moon Kingdom was destroyed, however, Queen Serenity was able to use the Silver Crystal to seal away Metaria and the Dark Kingdom; Metaria was imprisoned in the North Pole.
By the 20th century, Beryl, reincarnated herself, ventured to the North Pole and awakened Metaria, though she was still imprisoned. She corrupted the reincarnation of Beryl to once again serve her and to find the Silver Crystal in order to free her. The Shitennou were also reborn and corrupted to serve her. After Prince Endymion's reincarnation, Mamoru Chiba, is captured, Metaria possessed his body. When Sailor Moon, is forced to kill Endymion, Metelia is freed from him and absorbs him, Sailor Moon and the Silver Crystal into her. She grows and begins to cover the Earth, turning humans against each other. The Inner Senshi try to stop her, but she is too powerful, and they give up their power to awaken Sailor Moon within the monster. Sailor Moon and Mamoru appear to have survived and Sailor Moon teleports them out out Metaria, along with the Silver Crystal. Mamoru, with the advice of Kunzite, shows shows Metaria's weak point and, with Mamoru's support, Sailor Moon uses the power of the Silver Crystal and the power of the Silver Millennium to destroy the evil queen for good.
In the Stars arc of the manga, it was revealed that Metaria was an incarnation of Chaos.
Queen Metaria was a demon from the Sun that could absorb all energy and use it to expand her body and power. The more energy she gains, the further she can spread her dark body to wrap around the whole planet. Innocent people could then fall under her influence, turning them violent and attacking one another.
- Like all arch-villains in the Sailor Moon manga, she is an incarnation of Chaos.
- The spelling of her name has been debated. In Mixx's English translation and Viz dub, her name is spelled as "Queen Metallia", while the Kondasha translation spells it as "Queen Metalia". In the bunkoban editions of the manga, her name is shown in Latin letters as "Queen Metaria". The second anime spells the name on episode 12's title card as Queen Metaria.