Sage Art: Amphibian Technique

This technique is used by Shima and Fukasaku to fuse with Jiraiya and maximise his potential with sage chakra. While Jiraiya is in battle, he is unable to gather the natural energy necessary for him to access Sage Mode, as doing so requires him to be holding still. With this technique, Fukasaku and Shima sit on his shoulders, and while he is fighting, the two of them are holding still and gathering natural energy, which they then transfer into Jiraiya's body. This also eliminates the weakness of exhausting all of his natural energy in battle, as the two of them can gather natural energy for him continuously. Fukasaku and Shima were not able to fuse with Naruto Uzumaki because Kurama rejected them.

Trivia

 * The name of this technique is a pun. is the Japanese word for "amphibian", but the kanji literally mean "both lives" or "two lives", referring to how this technique fuses two living beings.