Si Xing Long or Nuova Shenron (Funimation) is one of Shadow Dragons in Dragon Ball GT and the dragon of Four-Star Ball.
Nuova Shenron, like all the other Shadow Dragons, was born from the negative energy of one of the wishes made on the Dragon Balls, in his case, the wish that restored Piccolo Daimao's youth.
Battling GokuNuova encountered Goku and Pan when they entered his domain, a city that he had reduced to a waste land. He first attempted to attack them from with a large flame orb and finally introduced himself as the "invincible four star dragon". After hearing about the demise of Haze, Rage, Oceanus, and Naturon which seemed to surprise him, Si fought Pan and easily avoided her attack, before he defeated her with a blow to the head. After Goku demanded that the dragon let her go, he did just that and put her out of harm's way. The pair then faced off and Si managed to dominate the battle, using his speed and ability to increase his body temperature. Goku found himself being chased by Si all over the city and finally transformed into Super Saiyan 4, after almost being destroyed by Si's Nova Death Ray attack. The Evil Dragon responded by shedding his outer shell and increasing his speed even more. Though this evened things out, Si's speed still gave him the advantage. Goku drew the Evil Dragon into a series of pipes below the city and managed to catch him off guard. However, he did not finish Si and stated that this was his way of thanking the dragon for not destroying Pan when he had the chance. Si said that he only wanted a fair fight and the two headed to the surface to finish their battle. However Si's brother, San Xing Long, appeared and ridiculed and assaulted him for being weak, though Si did not retaliate because they were brothers. San then fought against Goku himself, while Si watched from the sidelines. Goku however managed to easily fight San, who was forced to resort to freezing him solid. He ordered Si to incinerate him, but the fire dragon instead turned on his brother and used the heat of his attack to free Goku. San later used Si as a shield when Goku attempted to destroy him with a Kamehameha wave. When the Saiyan finally had the ice dragon at point blank range, Si asked Goku to spare him if he gave the Saiyan his Dragon Ball (despite believing San had brought this on himself). The fire dragon then gave Goku a medicine that would cure the blindness brought on by San's sneak attack. However, Yi Xing Long killed him immediately for his show of mercy. With his dying breath, Nuova said that he was sorry and only wanted a fair fight.
Fighting Super Yi Xing Long
Si Xing Long made a return during Goku and Vegeta's fight against Yi Xing Long. After Goku swallowed the Four-Star Dragon Ball in order to stop Yi from becoming Super Yi Xing Long again, the positive energy in the Saiyan's body recreated Si and he emerged, though apparently loyal to Yi. He asked to fight the pair alone, which Yi agreed to and the fire dragon managed to outmatch Vegeta. Si then fought against Goku, but the two quickly struck Yi and the fire dragon prepared a final attack, the Nova Sphere, a fiery sphere of energy that would destroy them both. As he prepared to unleash this attack, Si stated his contempt for Yi, since he killed him from behind. However, the fire dragon's taunts of how he was unaffected by the heat of his own attacks gave Yi the idea of possessing Si's body (an ability he had gained from Qi Xing Long) so as to protect himself. Despite Si's sacrifice, Yi used him to survive and when the blast dissipated, reabsorbed the Four-Star Dragon Ball.
Like many of the other Evil Dragons, Si Xing Long has power over an element, in his case fire. Like most of the other characters in Dragon Ball, he can use energy blasts though he mainly uses fire based attacks. It is unknown if he uses his wings to fly or if he does this by manipulating energy, like the other characters. Si can also shed his outer skin to enter in a much stronger form. In this form, all of this fire-based attacks, as well as his strength and speed, are increased dramatically.
- There are a number of theories behind what made Si Xing Long have honor and morals, something that is unique amongst the Shadow Dragons. One idea is the wish that created him. Since it was a selfish wish, it would have produced very little negative energy, unlike the other wishes, which had good intentions and resulted in more. Another reason may be the Dragon Ball that he possesses. The Four-Star Dragon Ball is most commonly known to belong to Goku and his adoptive guardian Son Gohan. Another theory is it is because of the fire element Si represents, which is sometimes seen a symbol of nobility and a number of protagonists use it in other media.
- His Funimation dub name is a play on the word "nova."