Ogata Saburo Koreyoshi's younger brother Ogata Shuma "Jiraiya" is believed to be the first "Ninjia" in Japanese folklore.
Jiraiya |
Jiraiya (in toad form) sounds like Rodan, Orochimaru (in serpent form) sounds like Godzilla and Gaira, Dojin Hiki (in eagle form) sounds like Mothra, and Tsunade's giant spider made a creaky noise somewhat similar to Ebirah.