Power Rangers Ninja Steel is an American children's television series that airs on Nickelodeon. It is the 2017 entry in the Power Rangers franchise. The show follows Brody Romero (William Shewfelt), Preston Tien (Peter Sudarso), Calvin Maxwell (Nico Greetham), Hayley Foster (Zoe Robins), Sarah Thompson (Chrysti Ane), and "Levi Weston"/Aiden Romero (Jordi Webber) who protect the Earth from Galvanax, a reigning champion from Galaxy Warriors who seeks the Ninja Power Stars to conquer the universe.

Ninja Steel Power Rangers Based at the school's Automotive Department, Ninja Steel Power Rangers' arsenal revolves around being powered by the Ninja Nexus Prism. In Power Rangers Dino Fury, the Ninja Nexus Prism were created by Morphin Masters. The Rangers transform using Ninja Battle Morpher in conjunction with Ninja Power Stars and each wield a Ninja Star Blade and Ninja Blaster.

Brody Romero Brody Romero (portrayed primarily by William Shewfelt; Taimana Marupo as a child) is the exuberant, youthful, and positive 18-year-old leader of the Ninja Steel Power Rangers and the son of a ninja master named Dane Romero. Ten years prior to the events of Ninja Steel, 8-year-old Brody was captured by Galvanax after his father mysteriously vanished.

After his capture, Brody was forced to work as a slave for Galvanax. During this time, he bonded with the robotic Redbot and a shape-shifting alien named Mick Kanic while gaining an enemy in his supervisor Ripcon. In the present after overhearing Galvanax's plan to get the Ninja Steel back on Earth, he, Redbot, and Mick take the opportunity to escape with the Ninja Nexus Prism. After being forced to use the ship's trash chute as an escape, he and Redbot became separated from Mick. Upon landing, he was attacked by Korvaka, but was saved by the unexpected arrival of Sarah and Preston. The three of them then pulled out three of the Ninja Power Stars, turning them into Power Rangers, with Brody becoming the Red Ranger and the team's leader.

As the Red Ninja Steel Ranger, Brody commands the ninja-themed Robo Red Zord that resembles Redbot.

Preston Tien Preston Tien (portrayed by Peter Sudarso) is a teenage magician obsessed with magic. He and Sarah go to investigate the object that fell from the sky and save Brody Romero from the alien Korvaka. The three of them then pull out three of the Ninja Power Stars from the Ninja Nexus Prism and become Power Rangers, with Preston becoming the Blue Ranger and the team's second-in-command. Preston also has a very wealthy businessman father Marcus Tien.

As the Blue Ninja Steel Ranger, Preston commands the European dragon-themed Dragon Zord. Uniquely, though, he wields powerful magical abilities.

Calvin Maxwell Calvin Maxwell (portrayed by Nico Greetham) is a teenager who is an expert mechanic. He becomes the Yellow Ninja Steel Ranger upon being saved from Ripperat by the Nexus Prism. He is also Hayley's boyfriend.

It was revealed that Calvin had a fear of driving after an incident where he crashed a go-kart into a duck pond and since used Hayley as his personal driver. With advice from Mick, Calvin overcame his fear to save the other Rangers from Tangleweb.

As the Yellow Ninja Steel Ranger, Calvin commands the Nitro Zord which is a dump truck-themed Zord. In addition, Calvin has a name for his personal vehicle, his yellow truck as "Nitro", and treats his truck as if it was living.

Hayley Foster Hayley Foster (portrayed by Zoë Robins) is a virtuous teenager who has a love for the outdoors, nature, and healthy living. She owns a pet Siberian Husky named Kody. Hayley became the White Ninja Steel Ranger upon being saved from Ripperat by the Nexus Prism. She is also Calvin's girlfriend and personal driver at the time he had the fear of driving. Her father Aaron (portrayed by Marcus Johnson) is a marine biologist and first appears in "Making Waves".

As the White Ninja Steel Ranger, Hayley commands the ninja dog-themed Kodiak Zord which resembles Kody and carries a kunai in its mouth.

Sarah Thompson Sarah Thompson (portrayed by Chrysti Ane) is the brains of the team and an adrenaline junkie. She intends to be a great engineer and is the person who designs gadgets to suit the Rangers' needs. As a new student at Summer Cove High, arriving on her handmade hoverboard, she runs into Monty and Victor. After Victor tries to use her hoverboard and crashes into Preston's magic show she and Preston notice objects falling from the sky. She and Preston go to investigate and save Brody Romero from the alien Korvaka. The three of them then pull out three of the Ninja Power Stars from the Ninja Nexus Prism and become Power Rangers, with Sarah becoming the Pink Ranger. Her mother Jackie (Jodie Rimmer) is also an engineer.

As the Pink Ninja Steel Ranger, Sarah commands the Zoom Zord which is a bullet train-themed Zord that resembles her hoverboard.

Aiden Romero/Levi Weston Levi Weston (portrayed primarily by Jordi Webber; Ethan Buckwell as a child) is a country singer. Levi Weston is the alias of Aiden Romero, who got separated from his brother Brody following Galvanax's attack on their father Dane Romero and took the alias as a way to hide in plain sight from Galvanax. At some point while working on his next album, he was captured and experimented upon by Madame Odius that involved the Gold Ninja Power Star that found him. His disappearance was reported by his manager Tom. One part of Odius' experiments on him was that she transferred his memories of being Aiden Romero into a human-like robot.

After being freed by the Astro Zord, Levi fought off every contestant that Odius sent after him. His true identity was revealed when he fought Ripcon after he captured Tom and had trapped the Rangers in a net. He fought off Ripcon and even helped the Rangers fight a Skullgator. Following the battle, Levi meets Mick Kanic who gives him the Storm Star and the Zord Star. When the Aiden Romero Robot is destroyed and following the destruction of Ripcon, Levi regained his memories of being Aiden in time for Summer Cove High's talent show. Brody learned the truth about Aiden/Levi when he joins him in singing the song that their father wrote for them.

As the Gold Ranger, Levi/Aiden commands the cowboy/ninja-themed Robo Rider Zord and the bison/ATV-themed Ninja Bull Zord, which combine to form the Bull Rider Megazord.

Allies Redbot Redbot is a ninja-themed robot that Brody befriends while they were slaves on Galvanax's ship. He serves as the inspiration for the Robo Red Zord.

Redbot is performed by Kohji Mimura in Ninja Steel, Emma Carr in Super Ninja Steel, and voiced by Byron Coll.

Mick Kanic Mick Kanic (portrayed by Kelson Henderson) is an alien slave from the Lion Galaxy with the ability to shapeshift into inanimate objects and was the head mechanic onboard Galvanax's ship until he, Brody and Redbot escaped via the garbage chute. His servitude on Galvanax's ship was because Princess Viera's family sold him and 100 other inhabitants of the Lion Galaxy to Galvanax.

After escaping, Mick became separated from Brody and Redbot, meeting up with Calvin and Hayley. They take him to their high school where Mick is mistaken for the new shop teacher by Principal Hastings and is hired on the spot.

Mick is skilled in mechanical engineering and repair, and is the top Mechanic on the Warrior Dome. He also has knowledge of Power Rangers and the Ninja Nexus Prism, and created more Ninja Power Stars for the Rangers' needs.

When Mick encountered Princess Viera, he told the Rangers about what her family had done to him and the Lion Galaxy inhabitants that were sold to Galvanax. Following Drillion's defeat, Princess Viera made amends with Mick by enabling him to contact his parents. Mick tells his parents that he is not coming home yet as he is helping the Rangers in their fight against Galvanax's forces.

Mick and Dane Romero were able to morph into their own variations of the Ninja Steel Red Ranger. Following Galvanax's destruction, Mick states to the Rangers that he is going to take a space taxi and pay a visit to his parents.

Mick later returns to Earth on a space taxi to warn the Rangers about the new season of "Galaxy Warriors", and thus have no choice but to stay with the Rangers, as he felt they still needed him when "Galaxy Warriors" is still around to hunt the Rangers.

General Tynamon uses Madame Odius' mind-control device to take control of Mick. After making a cover-up that is going to the Lion Galaxy to visit his sick parents, a mind-controlled Mick tells Odius that he can make a satellite to expand Odius' mind-control plot.

At the end of the series, Mick and Redbot choose to remain on Earth with the Rangers while maintaining contact with his parents in the Lion Galaxy.

Dane Romero Dane Romero (portrayed by Mike Edward) is the father of both Brody and Aiden Romero/Levi Weston, as well as the original Ninja Steel Red Ranger before the former. Dane is also an alumnus of Summer Cove High twenty years. After his wife died, sometimes after Brody's birth, Dane taught them the way of ninja and their signature Romero family song. He was the first to discover that the Ninja Nexus Prism landed on his yard, and was chosen to be its guardian. While inventing the Ninja Steel, his family was attacked by Galvanax and his Galaxy Warriors. Despite Dane's supposed sacrifice on splitting the Ninja Nexus Star into six Power Stars, Brody had been kidnapped by Galvanax while Aiden managed to escape and secure the Ninja Steel inside his father's high school trophy.

In "Galvanax Rises", Dane's soul is revealed to have been preserved inside the Ninja Nexus Prism and is later revived without physically aging while also becoming another variation of the Red Ranger alongside Mick. Following Galvanax's destruction, Dane and both of his sons along with the other Rangers, Mick and Redbot are having a camp together.

Shortly before the new season of "Galaxy Warriors", Dane briefly appears putting his trophy, which was used to contain the Ninja Steel, back to his old alma mater, then bidding his two sons a good luck for their school days before departing back home.

At some point after Madame Odius begins her final plan to enslave humanity while taking the power of the Super Ninja Nexus Prism for herself, Dane was among the brainwashed victims. The brainwashed Dane is enlisted to guard both Odius and the brainwashed Mick. Against his will, he attacked both of his sons and Preston until Hayley and Sarah destroy the mind control satellite situated on the Galaxy Warriors airship, thereby freeing him and the rest of the brainwashed victims.

Princess Viera Princess Viera (portrayed by Ruby Love) is the princess of the Lion Galaxy with the ability to shapeshift. Her family was responsible for selling 100 Lion Galaxy inhabitants to Galvanax, one of them being Mick Kanic. Viera is the owner of the Lion Fire Zord, which serves as her mode of transportation.

Sometime later, Viera arrived at the Warrior Dome ship to take her opportunity at fighting the Rangers on "Galaxy Warriors" with the aid of her royal guard Drillion. While she believes her family's "Might Makes Right" way, she doesn't seem to follow it as Sarah's kindness confirms this. This causes Viera to turn against Galvanax, causing him to convince Drillion into overthrowing her. This plot failed with the help of the Rangers as Viera plans to bring change to the Lion Galaxy. She makes amends with Mick Kanic by enabling him to contact his parents.

Viera later sends the Rangers Ninja Stars associated with the Lion Fire Zord and the Lion Fire Armor and a Lion Galaxy Spellbook for Preston to practice with.

Sheriff Skyfire Sheriff Skyfire (voiced by Mark Mitchinson) is an intergalactic police officer.