|This article is about a/an ally in Sekai Ninja Sen Jiraiya.|
Manabu Yamaji (山地 学 Yamaji Manabu?): Tetsuzan's young son, a 9-years-old third grade student. He becomes dissatisfied with himself after feeling that his older siblings and father treat him as being only half-capable as they are. He eventually creates a homemade battle armor as he becomes more involved in the war against the Sorcerers Clan, while using a slingshot as his weapon. He is also a talented artist when it comes to drawing portraits.
Manabu makes a guest appearance in Episode 31 of Kidou Keiji Jiban.
- Manabu's actor Takumi Hashimoto will go on to play Daim Tribe Knight Boi (TigerRanger) from the 16th Super Sentai series, Kyoryu Sentai Zyuranger.