Publication Information
- Jiraiya : Togakure-ryū Ninpō School
- Japanese :
- Loacation : Togakure-ryū Ninpō School
- Greater Loacation : Japan
- Leaders : Tetsuzan Yamaji
- Season : Sekai Ninja Sen Jiraiya
- Battled : Sorcerers Clan
Tetsuzan Yamaji

His wife Sanae was the daughter of Tetsuzan's master, but she was killed during a crossfire between Tetsuzan and the Sorcerers Clan eight years prior to the start of the series (when Manabu was an infant). He opened the Bujinkan ninpo dojo at his own apartment complex, but has received very few students outside his own children. He raises Bonsai trees at his spare time and owns two pets: Shiro, a carrier pigeon; and Kuro, a ninja-trained canine. One of his most notable characteristics is his great knowledge of the World Ninjas.
Dr. Smith

He dreams of combining his scientific technology with the ways of Ninpō to help protect the world. In his first appearance in Episode 11, he repairs and improves the Jiraiya Suit after it was damaged in battle by Chang Kung-Fu Jr. and Green Dragon, building the Power Protector upgrade parts as well. In Episode 16, he takes Toha's beloved car and rebuilds it into the Black Saber. When he was kidnapped by Gamesh alongside his colleagues Dr. Brown and Dr. Schmidt in Episode 23, he managed to escape using a Ninpō trick taught to him by Tetsuzan. He also wielded a fountain pen equipped with a laser gun that alters an enemy's brainwaves.
Toha Yamaji

To become Jiraiya, he wears the Jiraiya Suit and wields the deadly Optical-magnetized Light Vacuum Sword to defeat evildoers. He later gains the ability to upgrade his Jiraiya Suit by equipping over it the Jiraiya Power Protector. He works several part-time jobs to support his family. Toha is actually a descendant of the alien that brought the Pako to Earth 2300 years before the start of the series. He was adopted by Tetsuzan when he was an infant after his true parents, Hanzo and Chiyo were killed.
Kei Yamaji

When she dresses as Emiha to assist Jiraiya, she wears a white ninja armor similar to Jiraiya's. Her special technique, the Cherry Blossoms Rain Ninja Art, allows her to put enemies to sleep with a rain of white cherry blossoms. Her other technique, the Face Copying Ninja Art, allows her to create face masks of other people to disguise herself.
Manabu Yamaji

He eventually creates a homemade battle armor as he becomes more involved in the war against the Sorcerers Clan, while using pachinko balls as his weapons. He is also a talented artist when it comes to drawing portraits. Manabu makes a guest appearance in Episode 31 of Kidou Keiji Jiban.
Yamaji Family

Yamaji family are the main characters of the series, Sekai Ninja Sen Jiraiya, descendants of Togakure-ryū, 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.
Family Members:
- Tetsuzan Yamaji : Father
- Toha Yamaji / Jiraiya : Adoptive Son
- Kei Yamaji / Princess Ninja Emiha : Oldest Daughter
- Manabu Yamaji : Youngest Son