The Otomonin are mecha created by Yoshitaka that are normally hidden in the city until summoned by the Ninningers using their Ichibantou in conjunction with the Otomonin Shuriken for a summoning jutsu. The Otomonin can also combine through Shuriken Combinations.
Aka Ninger's humanoid Otomonin who pilots Shurikenjin, armed with the Drago Sword used for the Shurikenjin Splendid Slash finishing attack and the Drago Shield after the other Otomonin combine into an exosuit that Shinobimaru uses. When an auxiliary mecha take Shinobimaru's place in alternate Shurikenjin formations, Shinobimaru becomes the left arm in the combination instead of Dumpmaru. By combining with Bison King, Shurikenjin can become King Shurikenjin armed with the Bison Drago Sword used for the King Unprecedented Slash finishing attack. After Lion Haoh and Bison King combine into an exosuit that Shurikenjin uses, Shurikenjin pilots Haoh Shurikenjin that can perform the Haoh Splendid Buster finishing attack.
In the film Shuriken Sentai Ninninger vs. ToQger the Movie: Ninja in Wonderland, after ToQ-Oh takes Shurikenjin's place in the Haoh Shurikenjin formation and the Build Ressha combines with the exosuit, Haoh Shurikenjin becomes Haoh ToQ Daioh that is controlled by both the Ninningers and the ToQgers and can perform the Otomonin Connection Splendid Crash finishing attack.
Ao Ninger's dragon Otomonin, able to breathe the Drago Fire at its opponent and form the Drago Tornado around its opponent, that pilots Shurikenjin Drago able to fire the Shurikenjin Drago Burst finishing attack from its mouth, after it and Shinobimaru switch places in the Shurikenjin formation.
Ki Ninger's dump truck Otomonin, able to toss the Dump Makibishi at its opponent. Dumpmaru forms the torso in the Shurikenjin formations, normally forming the left arm unless an auxiliary mecha take Shinobimaru's place in the formations.
Shiro Ninger's ninken Otomonin, normally seen riding in Byunmaru.
Momo Ninger's magnetic levitation train Otomonin, able to toss the multiple Byun Shuriken at its opponent.
An elephant Otomonin that uses its trunk for its Paon Jet vacuum attack and assumes robot mode. Paonmaru can also take Shinobimaru's place to pilot Shurikenjin Paon, armed with twin Paon Axes used for the Shurikenjin Paon Boomerang finishing attack.
A flying saucer Otomonin that assumes robot mode and is the prototype of the other Otomonin. UFOmaru can also take Shinobimaru's place to pilot Shurikenjin UFO armed with the UFOmaru Launcher used for the Shurikenjin UFO Big Bang finishing attack.
Star Ninger's humanoid Otomonin that can pilot Bison King armed with the Bison Rifle used for the Bison Rough Buster finishing attack, after Star Ninger's ATV karakuri machine Bison King Buggy under goes Bison Change into an exosuit that Rodeomaru uses. These were created by Kinji using Yoshitaka's autobiography. By combining with Dragomaru, Bison King can become Bison King Drago armed with the Drago Sword.
A shark-themed submarine Otomonin that assumes robot mode on the Surfermaru Board. Surfermaru can also take Shinobimaru's place to pilot Shurikenjin Surfer armed with the Drago Sword used for the Shurikenjin Surfer Surfing Slash finishing attack.
A lion/castle-themed flying tank Otomonin, known as the Sky Otomonin, that assumes the robot mode Lion Haoh armed with two Big Shuriken used for the Big Shuriken Crash attack, through Lion Change. Lion Haoh's finishing attack is the Lion Chozetsu Slash. This Otomonin's essence can assume the human form Shishioh while leaving the body.
Shishioh is portrayed by Yukio Yamagata.
Aka Ninger's Vermillion Bird/glider-themed secondary Otomonin that can combine with other five secondary Otomonin to form Gekiatsu Daioh that can perform the Gekiatsu Fire and Gekiatsu Shot attacks and the Gekiatsu Grand Fever finishing attack. After Lion Haoh and Bison King combine into an exosuit that Gekiatsu Daioh uses, Gekiatsu Daioh pilots Haoh Gekiatsu Daioh that can perform the Haoh Gekiatsu Bomber attack and the Haoh Gekiatsu Number One finishing attack.
Ao Ninger's Azure Dragon/motorcycle-themed secondary Otomonin.
Ki Ninger's Black Tortoise/tank-themed secondary Otomonin.
Shiro Ninger's White Tiger/4WD vehicle-themed secondary Otomonin.
Momo Ninger's panda/helicopter-themed secondary Otomonin.
Star Ninger's carp/submarine-themed secondary Otomonin.
A tyrannosaurus Otomonin that assumes robot mode. It is originally a being called the "terrible dragon", which is the cursed form of Tatsunosuke Hakkaku awoken by Juza Yumihari just after Tatsunosuke is freed from the curse that turned him into a humanoid dinosaur. Shinobimaru removes the terrible dragon's horn, separating Tatsunosuke from it and bringing forth the Otomonin's true self. Dinomaru can also take Shinobimaru's place to pilot Shurikenjin Dino armed with the Dino Drill used for the Shurikenjin Dinomic Summer finishing attack and the Dino Hammer. It only appears in the films Shuriken Sentai Ninninger the Movie: The Dinosaur Lord's Splendid Ninja Scroll! and Come Back! Shuriken Sentai Ninninger: Ninnin Girls vs. Boys FINAL WARS.
In the film Super Hero Taisen GP: Kamen Rider 3, Kamen Rider Drive's vehicle is temporarily enlarged and converted into an Otomonin itself, that assumes robot mode and pilots Shurikenjin Tridoron taking Shinobimaru's place in the Shurikenjin formation. This form is controlled by both the Ninningers and Drive, and just like the original Shurikenjin, is armed with the Drago Sword used for Shurikenjin Tridoron Slash finishing attack and the Drago Shield.