Bijuumaru

Bijuumaru (尾獣丸, Bijuumaru) is a spy and assassin of Minccina's Uchiha Clan and it's counterpart the Keto Empire specializing in taking over castles, Bijuumaru & his kin had sworn loyalty to Madara.

Background
Bijuumaru was an Orphan and a Classmate of Paul Gekko. Paul Gekko found a white snake near his parents' grave, with Hiruzen explaining that it represents fortune and rebirth inspiring Bijuumaru to study kinjutsu and obtain knowledge of all techniques.

Abilities
His strongest technique is the Eight Branches Technique, which allows him to transform into an eight-headed, eight-tailed giant serpent bigger than the already colossal than the Tailed Beasts another reference to the Japanese myth. This was described as the ultimate snake-related technique, which turned the user into an immensely powerful "Dragon God".