Konenmaru

Konenmaru (こねん丸, Konenmaru) was Suiens' summoning animal that had met his fate at the hands of Kakashi's Raikiri in the Naruto: Mission: Protect The Waterfall Village (novel). Before he could kill Suiens' three amegakure teammates.

Appearance
Konenmaru had the appearance of a giant black utsurimono (写り物?) catfish with white markings. Which weighted more than the avenge size of a normal human being.

Personality
The giant catfish was very loyal and obedient to Suien, as if he was loyal at doing his job of eliminating and betraying his comrades sent by him. And fighting against his enemies.

Nature Transformation
The giant catfish had the great ability to use water release. Even when battling it's opponents, and even turning on it's comrades. That using the Water Release: Water Colliding Wave.

Trivia
Konenmaru in it's Japanese kanji (こねん丸), means "The concentration of thought round".