Tetsuzan Yamaji is the 34th grandmaster of the Togakure Ryū Ninpō, sworn to guard a stone tablet detailing the location of an artifact of untold power called the Pako which came to Earth.

But a fallen disciple of Togakure Ryū Ninpō named Dokusai stole one-half of the tablet years prior and established the Sorcerers Clan to steal the rest.

Besides his daughter Kei and her younger brother Manabu, Tetsuzan entrusts their clan's sacred duty to his adopted son Toha while bestowing the Jiraiya Suit that has been in their family for generations.

The Yamaji family (山地族, Yamaji-zoku) are the main characters of the series, descendants of Togakure-ryū (戸隠流), an ancient ninja order whose duty is to protect the Inscription, a piece of stone that points the location of Pako, a capsule that fell from space somewhere in Japan over 300 B.C., said to be the most valuable treasure in the world.

Space Ninja Demost (宇宙忍 デモスト, Uchuunin Demosuto, 37-41, 46, 48 & 49) is an alien who serves as the main antagonist for the series finale, originating from the Dark Planet (暗黒星, Ankoku-sei) before being sealed underground at Mount Kongō by Jiraiya's ancestor around the 4th century B.C.

In addition, he gives a morality lesson to the Rangers on respecting law enforcement like when Hayley Foster got ticketed by Summer Cove High School's security guard Clint.