Naruto

Name : Gamakichi
Affiliation : Konohagakure (Hidden Leaf )
Summoner : Uzumaki Naruto, Jiraiya
Seiyu : Youji Ueda

Gamakichi is child of Gamabunta. He was first summoned because Naruto could not focus his chakra during the beginning of the battle with Gaara. However, he is intelligent enough (more so than Gamatatsu) to be aware of the situation around him that at one point, he helps persuade Gamabunta to help Naruto during the battle against Gaara. He was summoned again by Jiraiya while fighting Orochimaru because Tsunade intentionally intoxicated Jiraiya with a chakra-disrupting potion.

He was summoned later by Jiraiya for a scouting mission during the Orochimaru's Lair arc, as well as by Naruto during the Noroimusha and Sea Country arcs. Note that these events happened only in the Naruto anime, so they're generally not seen as canon.