Azulongmon is an Exalted Dragon Digimon, one of the four Digimon Sovereigns and the Guardian of the Digital World's Eastern Hemisphere.
He is also one of the Four Great Dragons (alongside of Goldramon, Magnadramon and Megidramon). His Japanese name is Qinglongmon, derived from Qinglong, the Chinese astronomical name for the eastern quadrant of the sky. The Japanese word Seiryuu is also derived from this.
Azulongmon appears only in times of critical importance and favors the human/Digimon bond though he rarely helps them and others unless needed to.
Azulongmon first appeared at Digimon Adventure 02, where he gave his power to help Agumon digivolve into Wargreymon, later in digimon tammers, when Zhuqiaomon attacked the Tamers. He saved the humans and their partner Digimon and then shortly fought against Zhuqiaomon. He finally convinced Zhuqiaomon to not attack the Tamers so that they could focus on the true enemy, the D-Reaper. He told the Tamers the history of the Digital World and each of its layers. He and Zhuqiaomon later met with Baihumon and Ebonwumon to discuss the D-Reaper situation and helped to release Calumon's Shining Digivolution power which Digivolved every Digimon to their Mega forms. In the final battle against the D-Reaper, Azulongmon assisted Zhuqiaomon, Ebonwumon, and Baihumon into dragging the D-Reaper back into the Digital World during Operation: Doodlebug, thus saving the Tamers.