The Evil Dragons, known as Shadow Dragons in the Funimation Dub are a group that act as the last main villains of Dragon Ball GT. They are dragons that resulted from overuse of the Dragon Balls and were created from the negative energy of various wishes made by the characters throughout the Dragon Ball series.
Syn Shenron (Yi Xing Long in Japan), aka the One Star Dragon, or Super Yi Xing Long (Omega Shenron) as he later came to be called, is the last of the Evil Dragons. According in Dragon Ball GT Perfect Files, he was born from the wish to bring back everyone killed by Frieza and his men and, as a result of so many people being brought back, is the most powerful dragon. Unlike the other Evil Dragons, Yi does not represent an element. Instead, he has the ability to absorb the powers of the other Evil Dragons by swallowing the Dragon Balls.
Haze Shenron (Liang Xing Long in Japan), aka the Two-Star Dragon, is the first Shadow Dragon defeated and was born from the wish to bring back Bora. Since this was a small wish, this is likely the reason he is so weak. Haze uses the power of pollution to weaken his opponents.
Eis Shenron (San Xing Long in Japan), aka the Three-Star Dragon, is the sixth Shadow Dragon encountered and is the only dragon to have two different wishes explained for his creation. In the anime, he states he was created by the wish to bring back all of King Piccolo's victims. But in Dragon Ball GT Perfect Files, it was stated that he was born from the wish to make everyone forget about Majin Buu. Either way, the good intentions of these wishes result in Eis being a very dirty fighter. He represent the element ice.
Nuova Shenron (Si Xing Long in Japan), aka the Four-Star Dragon, is the fifth Evil Dragon encountered, but not the fifth to be destroyed. He was born from the first truly selfish wish, Piccolo Daimaou's wish to return his youth, and as a result, he is very honorable and has strong morals. Si was not destroyed by Goku, but was instead destroyed by Syn for his betrayal of the Shadow Dragons. He processes powerful fire-based attacks.
Rage Shenron (Wu Xing Long in Japan), aka the Five-Star Dragon, is the second Shadow Dragon to be defeated and was born from the wish to bring back Goku in order to fight Vegeta and Nappa. However, since the wish was used to bring back one person, he is weak. He uses the element lightning in combat, but rather than generating lightning, Rage uses Electric Slime to increase his size and strength.
Oceanus Shenron (Liu Xing Long in Japan), aka the Six-Star Dragon, is the third Shadow Dragon defeated and was born from a wish that Oolong had made to screw up Emperor Pilaf's. He wished for a pair of panties and, as such, she is extremely embarrassed by the wish that created her. Oceanus is alternatively good and bad, (she brings a village a great deal of fish and uses numerous dirty tactics when fighting Goku) since her wish was neutral. Oceanus is the only female member of the Shadow Dragons. She is also the only member to wield more than one element, water and air, though she seems to prefer using air-based attacks.
Naturon Shenron (Qi Xing Long in Japan), aka the Seven-Star Dragon, is the fourth Shadow Dragon defeated and was created by the wish to restore all of Majin Vegeta's victims. Despite this being a rather large wish, Naturon is the weakest of the evil dragons on his own and relies on his ability to absorb creatures in order to fight. Naturon represents the element Earth.