Rainenmaru

Rainenmaru was one of Suien's summons who appeared in Naruto: Mission: Protect The Waterfall Village! (novel). 
== Personality ==
Rainenmaru was very loyal to Suien. He was also violent towards his opponents. 
== Appearance ==
Rainenmaru was a giant black koi.
== Abilities ==
Rainenmaru had incredible speed and was powerful enough to take down Ryūrimaru and Naruto Uzumaki with a single blow.
 
pt-br:Rainenmaru