Ruiga, alongside his brothers, established a coup d'etat, which resulted in the death of the Land of Vegetables' daimyō. After their rise to power, the three brothers betrayed their allies, which included greedy and disloyal courtiers they had recruited, and slaughtered them all. The brothers themselves were distrusting of each other, and plotted to kill off the others in order to have more wealth and power for themselves.
Ruiga excelled in Water Release. His main technique put him at a tactical advantage. While a ninja normally requires an already existing supply of water to perform any water-based techniques, Ruiga possessed a special technique that allowed him to extract moisture from plant life to act as his source. He could then use that water to perform a number of versatile feats, such as imprisoning and drowning his opponents, or creating protective shields, as his technique would continue to manipulate the water. He could also use the water as a vessel to summon fish of various sizes and form, so they might assist him on land. He was also highly proficient in close-range combat, as evident from how skilfully he wielded his tonfa. He also used his tonfa as dowsing rods, which he could use to find water for his water technique.
Land of Vegetables Arc
He was able to defeat Kikujō by trapping him in a water bubble and summoning nin-fish to kill him, despite Kikujō being a "genius" ninja. Naruto Uzumaki managed to discover the source of his power, and he and Yurinojō lured him to a rocky area, where Chōji Akimichi drank all of the available water, rendering Ruiga unable to attack and his shark to be helpless. Chōji then defeated him using Human Boulder, but as Yurinojō was wounded, and Princess Haruna was still in danger, the three left him and continued on their journey. Ruiga saw Jiga approaching and begged for assistance, but Jiga said that, with him gone, he and Renga would have more power. Jiga then buried him with magnetic rocks, crushing and killing him.