Creator King Ryuuwon is the leader of the Jaryuu Clan, a race of reptilian monsters he created to serve him in hunting for the relics called Precious and wipe out the human race.
Two centuries ago, Ryuuwon was once a scholar who was obsessed with the lost civilization of Lemuria and was abandoned on an island by fellow researchers when they found treasure. That act resulted with Ryuuwon seeing the worst in humanity and used his knowledge of ancient Lemurian texts to create a potion that turned him into a near immortal monster and then use his blood to produce the Jaryuu as the first step of getting revenge on humanity.
While Jaryuu have been a thorn to the SGS's Boukengers, labeled as a Negative Syndicate, Ryuuwon makes his presence known when he captured Gordom's High Priest Gajah to obtain one of his civilization's treasures, the Brain of Gordom. However, tricked by Gajah, Ryuuwon ends up facing Bouken Red before being seeimgly killed off. However, Ryuuwon's immortality allowed him to survive the death blow. Since then, Ryuuwon has battled Bouken Red and the Boukengers, allying himself with the other Negative Syndicates who have a bone to pick with the Super Sentai team. During his attempt to steal the Lemurian Egg, Ryuuwon's origin were revealed.Eventually, the effects of Ryuuwon's enchance body begin to fail on him with only two Jaryuu left alive so he went after Pandora's box to seek more power for his ambition. But defeated by Gajah who has took the item for his agenda, Ryuuwon results in commiting suicide so that his helmet can be placed in the Precious Storage Bank where he would regenerate. Using the Preciouses in the storage unit, Ryuuwon reveals his goal to use the Lemurian Egg to completely purge his humanity and become a true reptile. But he was defeated by BoukenRed and returned to being human. Though Akashi attempts to convince the now human villain that his dream of purging his humanity is prove that he is still human, Ryuuwon still attempts to obtain the Lemurian Egg before the entire Precious Storage Bank was destroyed.
Five years after his death, Ryuuwon was revived into his monster form, thanks to the Precious known as the Heart of Hades and sacrfice of the last remaining Jaryuu. Facing his old rival Satoru, Ryuuwon finds himself facing the Gokaigers as they managed to remove the Heart of Hades from his chest before defeating him. However, the power of the Precious was still coursing through him as he tuned into a giant berserker before destroyed by Gokaioh.