Queen Metallia is the ruler of the Dark Kingdom. Since she is basically what appears to be a giant bowl of blood, she gives orders through Queen Beryl, her second-in-command. Queen Metallia also seems to be the source of energy for every inhabitant of the Dark Kingdom. After Beryl was mortally wounded in a battle with Prince Endymion, Queen Metallia posessed her body so that she could fight Princess Serenity herself. Eventually though, Metallia was destroyed in this battle with the princess.
Queen Beryl was left to rule the Dark Kingdom under the direction of Queen Metallia. Beryl was a fierce and strict ruler who allowed little room for failure. Her direct underlings were the four generals Jadeite, Nephrite, Zoicite and Kunzite. Though Queen Beryl seemed like an emotionless creature, she did fall in love with Prince Endymion when she attacked the Moon Kingdom of the Silver Millenium. After everyone's reincarnation 1,000 years later, Queen Beryl eventually brainwashed the Prince into the service of the Dark Kingdom. However, he was won back by Sailor Moon. Ultimately, Queen Beryl was fatally struck by a rose thrown by Prince Endymion.
-Jadeite was the first of Queen Beryl's generals to appear. His mission was to gather energy from humans so that the Dark Kingdom could release Queen Metallia and conquer the world. Jadeite chose a different identity (and outlandish plan) everyday, in order to gather the energy of a large group of people at once. Despite the fact that Jadeite eventually learned the true identities of Sailor Moon, Sailor Mercury and Sailor Mars, his repeated failures convinced Queen Beryl to put him to eternal sleep.
-Nephrite was the second of Queen Beryl's generals. He inherited Jadeite's responsibity of gatering the energy of humans. Unlike his predecessor, though, Nephrite chose a single identity (but he still kept the outlandish plans). His identity on earth was as the suave millionaire Sanjouin Masato. Also, instead of gathering the energy of many humans, Nephrite gathered the energy of one human at their "energy peak". After many of his attempts to collect enough energy failed, Queen Beryl charged Nephrite with the mission of loctating the Ginzuishou which also had the power to release Queen Metallia. While trying to achieve this, Nephrite met and eventually fell in love with Usagi's friend Naru. He also discovered Sailor Moon's secret identity. Unfortunately, just as Neprite vowed to reform and aid Sailor Moon, he was killed by Zoicite's henchwomen.
-Zoicite was the third of Queen Beryl's generals. He took over Neprite's mission after his unfortunate "accident". This general was a student of Kunzite (though their relationship seemed a little more than that ^_~), who was especially vain and despised any personal injury. Zoicite was charged with the responsibilty of gathering the seven Nijizuishou, which, when joined, would form the Ginzuishou. He had gathered about five of these crystals (Tuxedo Mask had the other two). Zoicite eventually learned of Tuxedo Mask's secret identity and struck a deal with him (after he and Usagi were taken hostage) for the last of the crystals. Despite the fact that Zoicite had learned the secret identity of Sailor Moon and had collected all of the Nijizuishou, Queen Beryl killed him because of his attempt on Tuxedo Mask's life (whom Queen Beryl did not want harmed).
-Kunzite was the fourth and most powerful of Queen Beryl's generals. Kunzite's responsibility was to retrieve the Ginzuishou from the Sailor Senshi. Since he blamed Sailor Moon for Zoicite's death, Kunzite turned his mission into a personal vendetta against the Senshi. After Tuxedo Mask was captured and brainwashed to work for the Dark Kingdom, it was also Kunzite's job to train and look after him. Eventually, while fighting the Senshi, Kunzite was killed by his own energy boomerang that had been deflected at him by Sailor Moon.
