Voiced By: Jeff Szusterman
Master Xandred is the leader of the Nighlok that was sealed away by the 17th head of the Shiba Clan. However, the seal was incomplete and Xandred eventually was awakened. Master Xandred spends most of the series trapped in the Netherworld while his Nighlok Army gathers enough fear for the Sanzu River to flood into the human world. When Serrator is scheming against him, Xandred ultimately decides to risk his life and travel to the human realm to regain Dayu’s loyalty. This succeeds but at the cost of him being severely injured. After recovering in the Sanzu River, Xandred returns to the human world during Dayu’s altercation with the Pink Samurai Ranger where sacrifices herself in order to give Xandred protection from the Sealing Symbol. With that method gone, the Samurai Rangers decides to attack Xandred with all their force and succeed in destroying his first life by using Shogun Mode. He grows and is destroyed by the Samurai Megazord.
Voiced By: Jeff Szusterman
Octoroo is Master Xandred’s most trusted adviser and is constantly seen trying to figure out a way to bring Master Xandred to the human world. Octoroo is last seen on the Junk after Master Xandred is destroyed and the Sanzu River seeps back into the Netherworld.
Voiced By: Kate Elliot
Played By: Rugen Du Bray
Dayu was once a human known as Dahlia that was transformed into a Nighlok after her husband Deker was transformed into a Human/Nighlok hybrid. She is eventually recruited by Master Xandred to play her harmonium for him after learning that was the one thing that tamed his anger. She leaves the Netherworld after Xandred destroys her harmonium and teams up with Serrator after he offers to fix it. He does not keep his promise however and she turns on him. However. Xandred does fix it and she returns to work for him for a short time. She meets her demise after Xandred sacrifices her to ensure that a new seal would not work on him.
Played By: Rick Medina
Deker was once a human that was transformed into a Human/Nighlok hybrid after his house went on fire. From then on, he was cursed with a desire to duel someone and eventually chooses Jayden as that person. He is defeated midway through the series but is resurrected due to his sword Uramasa breaking in the duel. He teams up with Serrator to get his sword fixed and turns on him after it is fixed. He challenges Jayden to a duel a second time and is destroyed by him for good.
Voiced By: Derek Judge
Serrator is a powerful Nighlok that was revived during Master Xandred’s power surge and offers his services to Master Xandred. However, Serrator is shown to have his own agenda and recruits Dayu & Deker to aid him in his plans to split the Earth in two with promises of fixing their prized possessions. He succeeds by attacking certain areas to enact a tear in the Earth. He only needs Deker to attack the final wedge to enact his plan but is betrayed by him and is destroyed. He grows but is destroyed by the Samurai Shark Gigazord.
The Moogers are lower level crab-like Nighlok that are used as foot soldiers by higher ranking Nighlok.
The Furry Warts live on the roof the Junk and often come down to repeat words spoken by the Nighlok.
The Spitfangs are crocodile-like Nighlok that are used by higher ranking Nighlok as extra muscle.
These robotic doll-like creatures are created by Serrator from paper to battle the Samurai Rangers in giant battles.
Venjix Computer Network
Voiced By: Cameron Rhodes
Professor Cog is a robotic servant of Venjix that travels to Earth to team up with the Nighlok in order to use their Sanzu River water to pollute Corinth. He successfully takes out five of the Samurai Rangers by teleporting them to his dimension and leads a combined army to get rid of the surviving Red Rangers. When the Samurai Rangers return to their dimension, he is destroyed by the combined efforts of the Red Samurai Ranger & Ranger Operator Series Red.
The Grinders are robotic warriors that are used by Professor Cog as foot soldiers.