He is armed with a bamboo-like spear and is laid-back and disturbing in personality. He was sent by Octoroo to increase the River by doing what he loves best, making others cry by getting them to give up on their dreams. Appearing in the mortal realm before a boy named Ryan, he accomplishes his goal by tricking the boy with a false promise of seeing his father again. His attack is the Tiger Tidal Wave creating a tiger from the right half of his body and a Sanzu River wave from his left to take out two opponents. He is destroyed by Kevin and Mia, and then destroyed by the Samurai Megazord. Later, he is seen attending a Halloween party alongside the other deceased Nighloks in the episode "Party Monsters".
- He, alongside Switchbeast, was shown to be one of the most evil villains in the Samurai season besides Master Xandred and Serrator despite only being a monster of the week, seeing how he admits to enjoying the sight of Ryan crying due to his so-called promise of seeing his father again by giving up on baseball was false.
- Namiayashi, his Super Sentai counterpart in Samurai Sentai Shinkenger.