Ryuga Kaiser

Ryuga Kaiser Jr., commonly referred to as, Lord Ryuga or Kaiser is a major antagonist, eventually an unsteady ally and antihero in the anime, Spirit Chi Warriors!. Ryuga is the son and reincarnation of the Demon King, Ryuga Sr. He is known as a world-class murderer and conquerer as he has been roaming earth, taking over and ravaging the lands in accordance to his father's dreams. Ryuga's manipulation over earth allows him to literally bend the fabric of the atmosphere of the earth and other planets. As the main antagonist of the Battle Testimony arc, Ryuga serves as a foil and rival to series protagonist, Yugi Typhoon, as well as a mysterious threat to Kai Szasazu. Ryuga's shady alliance with the almighty Ra is directly connected to his mother being slaughtered. Due to this, Ryuga adopts another spirit within his heart, representing his darker, and more carnage side. All of this results in Ryuga's desire to kill Yugi, and get back at Ra for what he did. Ryuga's closest friends are Crest Hollows, his loyal minister, who obeys his every command, and Lugia Hydro, an enemy turned friend who he bonded with after Lugia reformed himself. Ryuga is one of three beholders of the three Legendary Spirit Beasts to have ruled over the earth, having the Spirit Beast Rock Bison. Ryuga is apart of a Demonic Race filled with bloodthirsty humanoids who have spawned their own life, in search  of a home to conquer.

Shadou Ryuuga/Possessed Ryuga
Shadou Ryuuga/Shadou Ryūga (シャドウ リュウガ) is a possessed-state or form of Ryuga Kaiser. This entity is spawned from Ryuga's own hatred and loathing of both Ra, and Yugi Typhoon.