Kiriha Aonuma

Kiriha Aonuma is a blond teenage warlord who conquers others by coldly eliminating them. Before coming to the Digital World, Kiriha was the son of the CEO of the Aonuma Group, who treated the boy harsh to mold him into a successor by sending him to an elite school. However, orphaned at age ten, Kiriha loses his family's estate and fortune to those he and his family trusted. Kiriha's urge to become as strong as his father caught Bagramon's attention as he gave him a blue Xros Loader in secret. Soon after, Kiriha formed Blue Flare, a group that reflects his ambition to be strong and undisputed. Kiriha originally had an interest in Taiki Kudō because of his strength and abilities, helping him at times to persuade Taiki to join his army before being turned down. Kiriha decided to join forces with Nene Amano after before ending their partnership in the Forest Zone when she tries to force him to torture a defeated Stingmon for information, seeing such an action beneath him. He soon ended being controlled by DarkKnightmon's Darkness Loader to serve him as the new general of Twilight before Taiki snaps him out of it. Since then, now seeing Taiki as a worthy rival to him, Kiriha aided Xros Heart prior to losing his Code Crowns to Bagramon with his group the only active resistance against the Death Generals by the time Taiki and Shoutmon return from the real world.
After helping them free the rest of Xros Heart from Dorbickmon, Kiriha allies himself with Taiki and Nene to deal with the remaining Death Generals, having his group be dissolved into the Xros Heart United Army. In Canyon Land, Kiriha came up with a very dangerous plan to attack Gravimon. However, playing on Kiriha's emotions and revealing Bagramon's role in him gaining a Xros Loader, Gravimon brainwashes Kiriha to attack Taiki and the others to prove his strength. However, when Deckdramon is mortally wounded during his attempt to protect both him and their friends, Kiriha received closure when his father tells him that he was proud of him and that he was not alone anymore. Kiriha and his Digimon helped fight in the final battle against DarknessBagramon.
After the battle against DarknessBagramon, regaining some of his parents' fortune, Kiriha moved to America. Learning of the Digimon Hunt, Kiriha was skeptical of its true purpose and resolved to investigate it around the world. Despite his suspicions, he appears during the Digimon Hunter gathering alongside his Blue Flare Army, using ZekeGreymon to capture Volcdramon. He tells Taiki and the others that although he will continue investigating the Digimon Hunt and DigiQuartz, telling Taiki to look after Japan until they meet again. Arriving to Hong Kong soon after, Kiriha and Nene meet Rika Nonaka and Mimi Tachikawa.

Greymon (グレイモン Gureimon) is Kiriha's partner and main Digimon in the Blue Flare army. Like his human partner, Greymon valued strength above everything else and had no respect for Shoutmon as he tends to insult his size. Prior to being formerly introduced to Xros Heart at the Lake Zone, Greymon appeared when Kiriha needed to execute hit and run attacks on the Bagra Army. During the collapse of the Disc Zone, Greymon, MailBirdramon and Shoutmon were trapped amid the rubble. Even though Greymon and MailBirdramon initially gave up hope, seeing Shoutmon's determination both earned Greymon's respect and gave him the will to survive.

MailBirdramon (メイルバードラモン MeiruBādoramon)

A metal bird-like Digimon who serves as Kiriha's main mode of transportation. He forms the armor of MetalGreymon.