First Animal Path (character)

He was a ninja that fought Jiraiya during his journey for his disciple. His body was used by Nagato years later as the first Animal Path. In the anime, the character Naruto's fight with the ninja in Jiraiya's story is is slighty based off Jiraiya's fight with the Fuma ninja.

Animal Path
The Fuma ninja's body was used by Nagato as the first Animal Path in the Six Paths of Pain. The Animal Path was able to summon multiple animal summons possessing the Rinnegan and chakra rods. After he killed the Animal Path, Jiraiya noticed the scar on the forehead he gave to it when it was alive and realized it was not the real Pain. It was sent to Konoha by Jiraiya which helped solved Pain's ability to control dead bodies.