Jiraiya

Jiraiya (児雷也 - literally "young thunder"), the title character of the Japanese folktale Jiraiya Goketsu Monogatari (児雷也豪傑物語, "The tale of the gallant Jiraiya"), is a ninja who uses shapeshifting magic to morph into a gigantic toad. The heir of a powerful clan in Kyūshū of the same name, Jiraiya fell in love with Tsunade, a beautiful young princess who masters snail magic. His arch-enemy was his one-time follower, Orochimaru, who mastered snake magic.