Gerotora

He is a black and orange toad with dark markings around his eyes, mouth and a circular mark just below his mouth. As a scroll toad, his abdomen can extend to reveal a scroll which when concealed, gives him the appearance of wearing an obi.

Gerotora guards the scroll which acts as the holder of the "key" to the Eight Trigrams Seal located on Naruto Uzumaki's stomach. He was summoned during the Nine-Tailed Demon Fox's attack on Konoha by Minato Namikaze, who inscribed the key onto his stomach for safekeeping. Minato left the key to Jiraiya upon his death. About two years after Naruto started training under Jiraiya, Gerotora was summoned again. As Jiraiya began helping Naruto gain better control of the Nine-Tails' power, teaching Naruto to control its demon cloak up to producing two chakra tails, Jiraiya decided to have Gerotora unleash a bit more chakra. Gerotora was strongly against this action, but Jiraiya insisted they were ready. Gerotora did as he was asked, only for the plan to backfire. The Nine-Tails took advantage of this moment to force out more of its chakra, forcing Naruto into a "Version 2" state with four tails and seize control of Naruto's body. As Gerotora noted he was right to worry about this idea, Jiraiya quickly went into action to reseal the chakra and save Naruto.