Gerotora

This toad watches over the scroll which acts as the "key" to the Hakke Fuuin on Naruto's stomach. Jiraiya eventually left the scroll to Naruto, so that he can learn the key jutsuu. Also, Gerotora thinks Naruto isn't ready for this jutsu as he says in the manga.

Infiltration of Amegakure
He first appears when Jiraiya summons him, so they could talk about Naruto's key. He wants the scroll go to Naruto since he thinks that he was going to die. Gerotora angrily refuses, but had no choice.

Invasion of Pain
He was informed by Tsunade to call Naruto back from the Toad Sage Mountain. Unfortunately, he didn't had the chance as he was killed by Danzo.