Si Xing Long

四星龍

Si Xing Long is one of the seven Shadow Dragons, serving as the fifth opponent faced by Gokuu and Pan. He is the dragon associated with the Four-Star Dragon Ball and is the twin brother of San Xing Long. He embodies the element of fire. He came into existence when King Piccolo wished for the restoration of his youth during the events of the original Dragon Ball series. His name refers to a nova, an exploding sun, which alludes to his immense fire powers.
Si Xing Long is very loyal to his fellow Shadow Dragons, yet he remains fair to his enemies in battle, never resorting to desperate tactics regardless of the situation. He will even assist his enemies if he deems his brothers' tactics against them to be unfair and desperate. He is also one of the most serious dragons, rarely smiling and restricting his taunts to the heat of battle.
Si Xing Long's innate nobility and morals, which are unique among the seven Shadow Dragons, could stem from a number of sources. The most obvious is that he is the dragon of the Four-Star ball, a Dragon Ball that has always been associated with Gokuu and his adopted grandfather, Grandpa Gohan.
In his true form, Si Xing Long is one of the strongest Shadow Dragons, surpassed only by Yi Xing Long. Unlike most of his fellow Shadow Dragons, he is proficient in martial arts, allowing him to pose a great threat with or without his devastating elemental powers.
Si Xing Long's abilities are all heat based. He can raise his temperature to more than 6,000 degrees Celsius, effectively making him hotter than the surface of the Sun.