Gamahiro is a giant toad that resides on Mount Myoboku. He sometimes called: "Hiro".

When Gamahiro first appears in the anime, his skin is colored green and brown. This is updated to a light-blue-greenish color for the Invasion of Pain Arc, keeping up with the manga's coloration.

Though he was first summoned in part I, he was not named until he was summoned again in part II.

Though Gamahiro has spoken in the anime, he has yet to do so in the manga.