Kōsuke

Kosuke is a toad in which he was sent to watch what happens in Konoha, so that he could signal Myobokuzan.

Personality
He has a light color all over his body, and has a dark color on his mouth, part of head, and eyes. For some apparent reason, he wears the same goggles when Naruto Uzumaki wore at the academy. Behind Kosuke is the kanji word for "jin"(金), meaning gold. He seems to be a very happy person and cheerful person, and takes orders directly.

Invasion of Pain Arc
Kosuke was sitting on the Hokage desk, and was ordered by Tsunade to go to Myobokuzan and tell Fukasku to get Naruto back to Konoha to help the village's battle with Pain. When the room clears out, Kosuke prepared for reverse summon, only to be killed from behind by Danzo. His death would go unnoticed for most of the battle, until the toads at Myobokuzan discovered that Kosuke's name disappeared off the summoning scroll, showing that he has been killed, and there is trouble in Konoha.