Ryūrimaru

was Hisen's summoning animal that appeared in the light novel adaptation of Mission: Protect the Waterfall Village!. It was used by Shibuki when fighting against Suien.

Appearance
Ryūrimaru has the appearance of a crimson white catfish that was six times the size of a human man.

Personality
Ryūrimaru was very loyal and obedient to Hisen.

Abilities
Ryūrimaru had the ability to use Transformation Technique. With Hisen saying, "Dragon God Transform", Ryūrimaru transfoms into a giant golden dragon.