Forum:First Animal Realm's Real Name

The Realm name of Nagato's first Animal Pain can be found in the 3rd Databook, within Pain's entry:

''Caption Shinobi Faces: The previous identities of Pain Rikudou, as identified by Jiraiya. Among them is the face of Fuuma Ichizoku clan member, matching the rumors of the Amagakure shinobi.''

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Just a heads up.