Nighlok
Master Xandred
Voiced By: Jeff Szusterman
Master Xandred is the leader of the Nighlok that was sealed away in the Netherworld by the seventeenth head of the Shiba Clan. However, the Sealing Symbol was incomplete and Master Xandred is eventually able to reawaken in time, Master Xandred spends most of his time trapped in the Netherworld while his Nighlok Army gathers enough fear for the Sanzu River to flood into the human world, drinking medicine to cure his constant headache. When Serrator is scheming against him, Master 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, recovering in the Sanzu River until he returns to the human world during Dayu’s altercation with the Pink Samurai Ranger where she sacrifices herself in order to give Master Xandred protection from the Sealing Symbol. With that method gone, the Samurai Rangers decides to attack Master Xandred with all their force and succeed by having the Red Samurai Ranger use Shogun Mode. He grows giant and is able to rip apart the Samurai Gigazord piece by piece until he is destroyed by the Samurai Megazord.
Octoroo
Voiced By: Jeff Szusterman
Octoroo is an octopus-like Nighlok that 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 Master’s Xandred Ship as it sinks back into the Netherworld.
Dayu
Voiced By: Kate Elliott
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 Master 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, Master Xandred does fix it and she returns to work for him for a short time. She meets her demise after Master Xandred sacrifices her to ensure that a new sealing symbol does not work on him, with her body turning into a kimono.
Deker
Played By: Rick Medina
Deker was once a human that was transformed into a Human/Nighlok hybrid after his house caught on fire and his wife, Dahlia, making a deal with Serrator to save his life. From then on, he was cursed with a desire to duel someone and eventually chooses Jayden Shiba as that person. He is defeated a first time by the Red Samurai Ranger 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 challenges Jayden Shiba to a duel a second time, losing this duel and being destroyed for good by a final attack from Kevin.
Serrator
Voiced By: Derek Judge
Serrator is a powerful piranha-like Nighlok that was revived during Master Xandred’s power surge and offers his services to Master Xandred. However, Serrator has 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 activate a tear in the Earth. He only needs Deker to attack the final wedge to enact his plan but is betrayed by him after he weakens him with a slash from Uramasa before being destroyed by a combined blast from the Five Disk Cannon & Bullzooka. He grows giant but is destroyed by the Samurai Shark Gigazord.
Moogers
The Moogers are lower level crab-like Nighlok that are used as foot soldiers by higher ranking Nighlok.
Giant Moogers
The Giant Moogers are giant lower level crab-like Nighlok that are used as foot soldiers by higher ranking Nighlok while in their Mega Monster form.
Furry Warts
The Furry Warts are small creatures that live on the roof of Master Xandred’s Ship. They often come down to annoy Master Xandred by repeating words spoken by the Nighlok.
Dayu’s Furry Wart
Dayu’s Furry Wart is a Furry Wart thrown out of The Netherworld by Master Xandred. It is adopted by Dayu, being held by her most of the time until it is destroyed by Master Xandred after Dayu sacrifices herself to protect him from the Sealing Symbol.
Spitfangs
The Spitfangs are crocodile-like Nighlok that are used as extra muscle by higher ranking Nighlok.
Papyrox
The Papyrox are giant paper doll-like creatures that are created by Serrator from paper to battle the Samurai Rangers.
Venjix Computer Network
Professor Cog
Voiced By: Cameron Rhodes
Professor Cog is a cog-themed Attack Bot 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.
Grinders
The Grinders are robotic warriors that are used by Professor Cog as foot soldiers.
The Grinders transform into motorcycles for the Moogers to ride on in their fight against Ranger Operator Series Red & Red Samurai Ranger.