Ryuga

Ryuga (リュウガ) is Yuria's older biological brother and Juza's older half brother. He is born under the Sirius Star, which is considered the "lone wolf" of the heavens with its bright shine. As "the Star of the Lone Celestial Wolf", his destiny is to guide the successor of Hokuto Shinken in times of chaos.

History
Before the outbreak of nuclear war, Ryuga met with Yuria before the latter travelled to the Hokuto dojo to meet with Kenshiro. After fending off an outlaw attack on his estate, Ryuga told his sister not to worry about him, as he was fully willing to accept his destiny as the "Lone Celestial Wolf". Some time later, he personally went to the Hokuto dojo to secretly appraise the candidates for the art's succession, seeing if any of them would become the savior destined to bring hope to the world. Despite being quickly found out by Toki and Raoh, Ryuga gained much insight into their natures, deciding that each would bear watching in the near future.

After the destruction of civilization, Ryuga redoubled his search for a worthy savior for the post-apocalyptic wasteland that the world had become. He travelled to the Nanto capital and participated in the civil war between the forces of Thouzer and Shew to secretly appraise the Nanto Rokuseiken masters. Eventually, however, Ryuga became convinced that the true savior of the world was either Kenshiro or Raoh, with the deciding factor essentially becoming whether the world could be saved through kindness or force.

In order to test Kenshiro's worthiness as the "messiah of the end of the century", Ryuga allies himself with Raoh and becomes one of his lieutenants. Committing several horrendous acts, including an assault on the heavily ailed Toki, his actions ignite the younger brother's anger in a final confrontation. To Kenshiro's surprise, Ryuga accepts his punishment with little resistance as he had intentionally hurt himself before their fight.

In his final moments, Ryuga reveals his true duty is to guide and test who was actually worthy to lead the new age: Kenshiro or Raoh. Assessing that the kinder younger brother is more worthy, he gladly expresses his belief in Yuria's choice of lover before dying from his wounds. Toki's spirit lifts his body after his death and they both become stars in the heavens. It is later revealed that Ryuga had assaulted Toki as part of a mutual agreement; they had hoped to awaken "true sorrow" in Kenshiro's heart so he could gain the ultimate technique of Hokuto Shinken.

Quotes

 * "The lone wolf's destiny is steeped in blood!"

Fighting Style
Taizan Tenrōken (泰山天狼拳 "Tai Mountain Heavenly Wolf Fist") severs flesh from its victims with fast, slicing attacks, severing their nerves so quickly that it inflicts a cold sensation before they die. Ryuga makes several wolf-like poses while performing his attacks. Unlike most of the martial artists in the series, Ryuga's fighting style belongs to neither the Hokuto or Nanto disciplines. One of Ryuga's signature techniques is Tenrō Tōga Ken (天狼凍牙拳 "Heavenly Wolf Freezing Fang Fist").