Syn Shenron Character Facts

Syn Shenron appears as a large, humanoid, white, black and blue dragon. Two large, fleshy horns emerge from the top of his head, and a pair of tiny feelers emerge from his upper lip, giving the appearance of a mustache. Long black spikes protrude from his shoulders, elbows, back, and knees. Two more fleshy spikes protrude from the sides of his chest, and his abdomen and the back of his head are dark blue. The One-Star Dragon Ball is visible on his forehead, sporting the blue color and cracked appearance of all the corrupted balls.
Like the other Shadow Dragons, he is formed by the build-up of negative energy inside the Dragon Balls, released when the Z Fighters attempt to wish away the damage done to the Earth by their recent battles. Syn Shenron was born from the wish made by Mr. Popo to revive everyone on Namek that was killed at the hands of Frieza and his soldiers. Even though he was not born from the first wish made in the Dragon Ball series, the most likely reason he is the most powerful of the Shadow Dragons is the sheer scale of the wish; not only intended to give those who died another chance at life, but also part of an ingenious, cunning plan by King Kai to bring Porunga back to life so he could grant one last wish to move everyone on Namek except for Frieza (and later, after King Kai reluctantly agreed, Goku) to Earth, while Frieza would be left on Namek to die when it exploded (although not everything went according to plan, it still worked out in the end). The sheer scale of this wish (in fact, it was the only one that made Shenron wonder if he had the power to grant it) produced a tremendous amount of negative energy, most likely creating the most negative energy of all wishes, accounting for Syn Shenron's overwhelming power and making him the most powerful among the other dragons. The selflessness of the wish (made to restore Namek's dragon in order to wish the population away from the dying planet) accounts for his purely evil nature.
Being born from one of the strongest selfless wishes, Syn Shenron is the most selfish, uncaring, and evil-hearted of all the Shadow Dragons. He does not feel any compassion for life, even destroying his fellow Shadow Dragons if it means accomplishing a selfish goal. Unlike Nuova, Syn will not fight in a fair match, and will not wait for an opponent to recover from their injuries. He can become arrogant in times of complete dominance against his opponents, sometimes letting them suffer slowly, and mocking them before the next fatal attack. Unlike past villains, Syn Shenron knows his limits and will attempt to prevent his enemies from powering up instead of allowing them to do so to make the fight more interesting. If overshadowed by a stronger opponent, Syn can be driven to fear and worry, but he usually attempts to hide it as quickly as he can (his proud facade is finally destroyed in his last moments, when he realizes that he cannot stop Vegeta's Universal Galaxy Explosion.
After Syn Shenron absorbs the other six Dragon Balls and corrupts them with his negative energy, he assumes his empowered form of Omega Shenron. In this state, the One-Star Dragon Ball moves from his forehead to his chest, surrounded by the other six Dragon Balls (five when Goku swallowed the Four-Star Dragon Ball, which was originally located north-east of the One-Star Dragon Ball). The ten spikes on his body (two on his elbows, two on his shoulders, and six on his back) become even longer than before, most noticeably the two on his elbows, and he develops even more on different parts of his body, including his knuckles and shoulders. He loses the fleshy spikes on his chest, and his horns move closer together, with a narrower angle between them. 
As Omega Shenron, being the dragon of absolute destruction, his brutal personality becomes more pronounced and he becomes intent on destroying everything and everybody that stands in his way. He is nearly invincible in this form and is only outclassed by the fusion of Super Saiyan 4 Vegeta and Super Saiyan 4 Goku, Super Saiyan 4 Gogeta. He easily beats up Vegeta, Goku, Majuub, Gohan, Trunks, and Goten, and nearly managed to destroy the Earth through the mere release of his negative energies.