Jayden Shiba / Red Samurai Ranger | (Actor: Alex Hartman)
Voiced by: Koji Yusa (Japanese dub)
Let me warn you right now - if you follow me, there is no turning back.
- Arch-Enemy: Deker. As much as Jayden would like to deny it, some part of him does crave fighting Deker, while Deker is obsessed with fighting him at his peak. Their conflict is one of the most personal in recent Power Ranger history.
- Big Little Brother: Younger than Lauren, but nearly a head taller.
- Blood Knight: Not completely, but it is something that he fears he will become if he pursued his rivalry with Deker just for the sake of fighting him. As pointed out below in Not So Different, some part of him wanted to fight Deker on his own.
- Compressed Adaptation / Adaptation Distillation: Jayden's Blood Knight implications are a cemented character flaw from his Shinkenger counterpart, but due to the Lighterand Softer tone Samurai aims for, it's all but never addressed outside of the line establishing it.
- Determinator: He never, ever gives up. His sheer willpower is enough to unnerve Deker.
- Expy: Of Jason, except for the loudness.
- Heroic B.S.O.D.: Gets one after Master Xandred targets him and the other Rangers are hurt protecting him. He runs off for a few days and tries to avoid putting them in harm's way.
- The Leader: Type IV; charismatic. The others are Taking the Bullet loyal to him and have great difficulty accepting his older sister Lauren as their new leader as she's not him.
- Not So Different: With Deker. He outright admits in "The Ultimate Duel" that some part of him wanted to fight Deker, rather than just doing so to prevent him from harming innocent people.
- Playing with Fire: He can control fire. The fact that his sister can do the same is one of the biggest signs that he's not the real Red Ranger.
- Pretty Boy: Oh so very, very pretty. Compare with Takeru.
- The Quiet One: Still more open to his teammates than Takeru, though.
- Standardized Leader: His personality is pretty flat aside from the fact that he's the leader.
- Take a Third Option: He firmly believes there is always another way when the first two options look bad, and even calls Deker out on this. However, sometimes there isn't a third option.
- Weapon of Choice: The Fire Smasher.
- Worthy Opponent: To Deker, who seeks him out for most of the season to have the "ultimate duel" so he may break his curse.
Kevin / Blue Samurai Ranger | (Actor: Najee De-Tiege)
Voiced by: Tsuguo Mogami (Japanese dub)
- Black Best Friend: To Jayden.
- Butt-Monkey: Seems to be going down this road.
- Honor Before Reason: Despite Antonio being incredibly fast and strong, Kevin is very reluctant to him joining because he wasn't born a samurai.
- The Lancer: Second in command and able to fight Jayden equally.
- Making a Splash: He controls water. On top of combat, it's also useful for fishing.
- Sleep Cute: With Mia.
- The Stoic: It takes a lot to make Kevin lose his cool, and he's normally the least emotional of the Samurai.
- Teacher's Pet: To Mentor Ji. Negatron lampshades it in "Sticks and Stones".
- Uncle Tomfoolery: Adding traits from Ryuunosuke seems to be turning Kevin into this.
- Weapon of Choice: The Hydro Bow.
Mia Watanabe / Pink Samurai Ranger | (Actress: Erika Fong)
Voiced by: Sachiko Kojima (Japanese dub)
- Action Girl: Just as good a fighter as any of the guys.
- A Day in the Limelight: "He Ain't Heavy Metal, He's My Brother" explores her past and history with her guitarist brother.
- Blow You Away: Her Ranger powers revolve around manipulating wind, particularly with her Sky Fan.
- Butt-Monkey: Whenever her cooking comes into question.
- The Dreaded: When it comes to her cooking. Kevin is even willing to go against his usually strict regimen to avoid eating any of it.
- Freeze-Frame Bonus: Her last name is officially confirmed by her driver's license as seen in "A Strange Case of the Munchies".
- The Heart: She's the one that holds the team together. She's also the one to feel Sympathy for the Devil for Dayu after learning about the latter's Dark and Troubled Past.
- Hidden Depths: She's a competent singer, and used to be in a band with her younger brother before becoming a Samurai.
- Lady of War: Contrasting Emily's Cute Bruiser.
- Lethal Chef: She doesn't think so, but the rest of the Rangers attest otherwise - though like with Mako, they're too polite to do so to her face (Kevin, for example, has the decency to throw away her burnt chicken while she's not looking). Fear is another possibility. We've seen her use her Samurai katana to slice a squash to bits, they might just feel it's not smart to offend somebody with samurai training and easy access to knives.
- Negatron proves she is at least afraid she is. The insult he used to send her flying was "lousy cook", and she later asks everyone if she really is that bad. As stated before, they deny it not to bring her down more.
- Even Emily is wary of her cooking (remember that, in the original, Kotoha thought Mako was flawless even in this department); in "Team Spirit", she goes so far as to cautiously ask if it was Mia who baked her birthday cake.
- It may have something to do with the fact she's using a KATANA to cut fruit. The ingredients she uses on the other hand....
- Noodle Implements: We never learned what she was planning to cook, but we do know it involved combining oysters, chocolate sauce and Brussels sprouts in a very specific way.
- Sleep Cute: With Kevin.
- Sympathy for the Devil: Feels sorry for Dayu after seeing what happened to her in "Broken Dreams".
- Team Mom: She's the most emotionally mature member of the team, and frequently takes this role when it's only the five of them. She's also the Team Chef, but the less said about that, the better.
- This Is Unforgivable!: In "Deal with a Nighlok", she and Kevin both hear Doubletone out when he explains that his plan was to get Ryan to give up on his dream of baseball by convincing him that doing so was the only way for him to see his daddy again, just so he could get him to cry and enjoy it. Not one to take that well, she says this trope to Doubletone himself.
- Weapon of Choice: The Sky Fan.
Mike / Green Samurai Ranger | (Actor: Hector David, Jr.)
Voiced by: Wataru Hatano (Japanese dub)
- Ambiguously Brown: Aside from "hot", what is he?
- Can't Catch Up: Mike sees himself in this position early on, afraid that he'll never be able to hold a candle to Jayden in combat.
- Crouching Moron, Hidden Badass: Especially in Super Samurai. Just look at his plan to defeat Switchbeast.
- Green Thumb: Uses the power of "Forest".
- Informed Flaw: Mentor Ji makes several implications in "Forest For the Trees" that Mike has a stubborn and rebellious streak.note Mike never displays any of these qualities. Training scenes centered around Mike serve to in fact Joss this.
- It's Not You, It's My Enemies: A platonic case. Because of his Ranger duties, Mike has to tell his friends he won't be able to hang out with them for a while. Additionally, it's implied that all the Rangers are forbidden to see their families until the enemy is defeated for this very reason. It's mentioned he even had to skip his graduation.
- Ship Tease: With Emily. They Do in the Grand Finale.
- Weapon of Choice: The Forest Spear.
Emily / Yellow Samurai Ranger | (Actress: Brittany Anne-Pirtle)
Voiced by: Ayaka Shimoyamada (Japanese dub)
Just like chopping down weeds back home.
- Action Girl: Don't let Emily's sweet exterior fool you. She'll cut you down without remorse if you're a Nightlok.
- A Day in the Limelight: "Sticks and Stones" fleshes out her character and shows the real reason she's a Samurai Ranger.
- Always Someone Better: Her sister Serene is unwittingly this to her. Emily struggles with the possibility that she'll never be as good a Samurai as Serena.
- Big Sister Worship: She admires her older sister, the original Yellow Samurai Ranger. There's also the non-family example with Mia.
- The Chick: Kind, sweet and supportive, Emily is a textbook case of this trope.
- Cute Bruiser: Contrasting Mia's Lady of War.
- Country Mouse/Farm Girl: She's from the countryside.
- Dishing Out Dirt: Uses Earth-based powers.
- Got Volunteered: Her sister Serena was originally supposed to be the Yellow Samurai Ranger. When she came down with an incurable disease, Emily was the only one able to step into the role.
- Resigned to the Call: She's fine with being a Samurai Ranger nowadays, but still occasionally struggles with the idea that she'll never be as good as his sister.
- Hidden Depths: It's highly implied that she suffers from depression, given her lack of reactions to the insult monster.
- The Klutz: Before becoming a Ranger. She still has moments of it afterwards.
- No Celebrities Were Harmed: Adapting Kotoha's best known traits has turned Emily into Kellie Pickler.
- Only Sane Woman: Is consistently the one to dismiss Kevin's cries of Honor Before Reason, and points out that they need Antonio.
- Self-Deprecation: Just like her Shinkenger counterpart.
- Ship Tease: With Mike. They Do in the Grand Finale.
- Tomboy and Girly Girl: Tomboy to Mia's Girly Girl.
- Weapon of Choice: The Earth Slicer.
Antonio Garcia / Gold Samurai Ranger | (Actor: Steven Skyler)
Voiced by: Atsushi Imaruoka (Japanese dub)
That's it? No "Thanks for helping", or a little "What? What?" Alright, I get it. You need a minute.
- Blade Spam: Thanks to his speed, he can slash his enemy enough times before they even know it happened.
- Catch-Phrase: "Fantastico!"
- Alternatively, "Golden!"
- Chrome Champion: Very shiny, especially in his Mega Mode.
- Companion Cube: All the Rangers are like this to an extent with their miniature zords, but Antonio actually celebrates Clawzord's birthday.
- Crouching Moron, Hidden Badass: A bit bumbling and hammy, but when he wants to kick Nighlok ass, he WILL kick Nighlok ass.
- Dynamic Entry: The whole reason he ran from the Rangers when they found out he shot an arrow at their base: he wanted to make one of these and eventually does.Antonio: "When I make an entrance, it's go big or go home."
- Gadgeteer Genius: Built his own morpher, and synchronized it to the Octozord. After this, he's often put to work on completing other unfinished gear.
- Gratuitous Spanish: ¡Fantastico!
- Iaijutsu Practitioner: Antonio mastered this way of fighting - self-taught with a Reverse Grip no less. It's taken Up to 11 here: his quickdraw ability is such that by resheathing his sword after each strike, he is able to spam it, making a dozen strikes before he even appears to have done anything.
- Incoming Ham: "CATCH OF THE DAY!"
- Large Ham: Even for Power Rangers. Sure, the Sentai footage of Genta would have looked like Stock Footage Failure otherwise, but it still takes a lot to be considered a Large Ham in a franchise that's already a World of Ham.
- Light 'em Up: His symbol power is light.
- Loophole Abuse: He's technically not a samurai, so he doesn't have to obey Jayden's orders if he doesn't want to.
- Self-Proclaimed Knight: He doesn't have the samurai lineage like the others but trained himself to be one.
- Sixth Ranger: Naturally. The fourth DVD volume is even named the same as the trope. 
- Super Speed: As in moving at the speed of light, which he must do if he takes out enemies while appearing to move at normal speed.
- The Smart Guy: He's the most technically savvy of the team, especially since he built his own morpher. It helps since he can fix damaged zords.
- The Unchosen One: The only Ranger not from a samurai bloodline, he trained himself since childhood and built his own morpher.
Lauren Shiba / True Red Samurai Ranger | (Actress: Kimberley Crossman)
Voiced by: Houko Kuwashima (Japanese dub)
- The Ace: She has the true sealing power, saves the rangers in her introduction, schools them in sparring, and even likes Mia's cooking.
- Action Girl: Being Jayden's older sister, she's been given a considerable amount of training. Both in symbol power an physical combat.
- Ancestral Weapon/Tragic Keepsake: Her Samurizer was her father's.
- Authority Equals Asskicking: As Jayden's older sister she is the true head of the Shiba clan and so possesses greater fire symbol power.
- Big Damn Heroes: Makes a grand entrance by saving the other Rangers' collective bacon in the Lion Foldingzord.
- Big Sister Instinct: In her introductory episode when she's reunited with her then-injured little brother, she caresses his cheek as a gesture of comfort.
- Bizarre Taste in Food: She can stomach Mia's cooking.
- Cool Big Sis: For Jayden. They are very close.
- Distaff Counterpart: To Jayden as the Red Ranger.
- 11th-Hour Ranger: An odd variation, as she actually replaces Jayden as the team's leader, rather than straight-up joining the team. Subverted when she's hurt and gives the job back to Jayden before the true final battle.
- Magic Knight: Given her skill in both swordplay and symbol power, it makes sense.
- Playing with Fire: Runs in the family.
- The Spartan Way: Emily remarks that she must have 'trained night and day' to become so skilled a samurai. She replies this was more or less the case: train, exercise and practicing the sealing power was her life from early childhood.
- Walking Spoiler: Seen how much of this entry is hidden in spoiler cover?
Mentor Ji | (Actor: Rene Naufahu)
Voiced by: Yoji Ueda (Japanese dub)
- Adaptational Jerkass: As noted below, due to being partially based off of Tanba, he's a lot more abrasive than his direct Shinkenger counterpart, Hikoma Kusakabe.
- Blade on a Stick: Wields one during the penultimate battle with Xandred's Mooger horde.
- Composite Character: While he was based off and even named after Jii from Samurai Sentai Shinkenger, he also carries some aspects of Tanba, particularly due to rejecting Antonio for not being born from a Samurai Clan.
- Cool Bike: Owns one.
- Mythology Gag: In ''Clash Of the Red Rangers," Ji is revealed to have his own Samuraizer (Though it's unlikely he can Morph with it) that uses Brown Kanji. This may be a reference to Shinken Brown. note
- Old Master: He's a seasoned Samurai.
- Team Mom: He cooks, cleans, and generally looks after the Rangers as if they were children (especially when they're sick). He also cries at weddings.
- You Look Familiar: Rene Naufahu was previously seen as Emperor Gruumm, including a single scene in a single episode out-of-costume.
Bulk and Spike | (Actors: Paul Schrier and Felix Ryan)
Voiced by: Kazumasa Katsura (Bulk) and Kousuke Okano (Spike) (Japanese dub)
- Advertised Extra: Their screentime all season is quite minimal despite being billed as main characters. They're lucky to appear more than once an episode.
- Annoying Laugh: Spike. He got it from dad.
- Bald of Awesome: Bulk's gotten rid of his trademark ponytail in favor of this.
- The Bus Came Back: Skull appears in the finale.
- Butt-Monkey: Even after all these years, Bulk just doesn't catch a break sometimes. And generally, Bulk tends to abuse Spike and the universe tends to abuse Bulk. Skull gets in on it, too, both giving and receiving abuse in his cameo scene.
- Call-Back: In episode 3, Bulk wears clothes similar to what he wore in the old days, namely a jean vest and a bandanna.
- Demoted to Extra: At least, in comparison to Bulk with Skull in the good old days. They've only occasionally gotten caught up in monster attacks and have almost never interacted with the Rangers in their civilian identities. That said, it's still better than Bulk's handful of cameos in Power Rangers Lost Galaxy.
- Generation Xerox/Spin-Offspring: Straight from Spike's actor, Skull is a daddy. And his son is like him in almost every detail, even the voice is pretty spot on.
- Honorary Uncle: Bulk to Spike. At least we think it's honorary...
- Hopeless Suitor: Spike likes the Pink Ranger - like father, like son. Only in Skull's case, he had a crush on the girl not knowing she was the Pink Ranger. Spike initially focuses on the Pink Ranger herself without knowing who is wearing the helmet and suit. He later meets and gets a crush on Mia out-of-morph, forming a Two-Person Love Triangle of sorts... with Mia herself being none the wiser.
- Nice Guy: Bulk's Character Development from previous years has stuck as he's firmly one of these now.
- Those Two Guys: The triumphant return of the quintessential example.
- Upper-Class Twit: Going by the finale, the Skulloviches, of all people, seem to have come into money sometime since "Forever Red". Either that, or Skull's piano skills have finally paid off.
Serena | (Actress: Jacinda Stevens)
Voiced by: Yumi Kawashima (Japanese dub)
- Cool Big Sis: To Emily.
- Ill Girl: She was too sick to become the Yellow Ranger.
- Not Even Bothering with the Accent: She retains her New Zealand accent, while the actress who plays Emily's younger self clearly has an American accent.
- Soap Opera Disease: In "Sticks and Stones," it's revealed that she contracted an undisclosed disease that resulted in Emily taking her role as Yellow Ranger.
Terry Watanabe | (Actor: Jaever Santos)
- Cool Big Sis: Sees Mia as cool enough to sing in his band.
- Secret Keeper: Knows why Mia had to leave home, and who the other Rangers are. While it's been unusual in the past for siblings to know that their brother or sister is a Power Ranger, it's explicitly a lineage-based thing this season, so it's not so out-of-place.
Scott Truman / Ranger Operator Series Red | (VA: Tobias Reiss aka Eka Darville)
- Cool Sword: Street Saber
- Morph Weapon: Nitro Blaster/Sword
- Foil: Clash of the Red Rangers showed how he and by extension the RPM Rangers differed from the Samurai team, how they were, for lack of a better term, from two different worlds. Scott comes a from world based around technology; he lives in Corinth, a domed city run by the military, he drives a car, his suit has a clear vehicle theme to it and he opposes an army of evil robots. He is put off by how "old school" the Samurai Rangers are; they live in a mansion with a dojo, no TV or video games, and use swords and magic to combat a demonic force.
- Stage Names: Tobias Reiss was Eka Darville under a pseudonym, as revealed by Alex Hartman at 26:36 of Power Rangers: Celebrating 20 Years Q&A Panel - RangerStop 2013. Darville became a SAG member not long after RPM ended, which prevented him from appearing in-person as Power Rangers has always been a non-union show. Darville instead took up the Tobias Reiss pseudonym as a loophole.
- Law of Chromatic Superiority: He's the only RPM Ranger who is involved in the story of "Clash of the Red Rangers".
- Shipper on Deck: For Mike and Emily.
Master Xandred | (Voice actor: Jeff Szusterman)
Voiced by: Yoji Ueda (Japanese dub)
- Adaptational Jerkass: Well he was still evil in Super Sentai, this version has all of his wort elements and dickishness cranked up with his Pet the Dog moments from the original version adapted out.
- Authority Equals Asskicking: He's dealt with Nighlok trying to usurp his thrown with relative ease, has proven more powerful than Serrator, and when he finally comes out himself in "The Master Returns", he beats the hell out of the Rangers with absolutely no effort. While drying out! It's clear the Rangers would be in deep trouble if he could actually leave the Sanzu River.
- Bad Boss: He yells at and assaults his minions regularly.
- Big Bad: For this season.
- Big Entrance: In "The Master Returns", his arrival on the human world is accompanied by a storm blacking out the sun, and rocks assembling themselves into a door with red light shooting out of the gaps that explodes when he emerges from it.
- Devour the Dragon: Kills Dayu and absorbs her humanity. This lets him No-Sell Lauren's Sealing Symbol, but gives him a vulnerable point that allows a good, old-fashioned asskicking.
- Evil Plan: Flood the earth with the Sanzu river.
- Famous Last Words:Master Xandred: Impossible! Samurai Rangers, hear me now! You have won this battle, but our quest to rule your world will never end! You may have defeated me... but the Nighlok will rise again!
- Final Boss Preview: "The Master Returns" has him dish one out, demolishing everyone in his path until he dries out rapidly and has to return to the Netherworld.
- Frothy Mugs of Water: His "medicine".
- Grievous Harm with a Body: Occasionally uses a Mook to shut someone up... by throwing it at them.
- Hair-Trigger Temper: He gets angry very easily.
- Handicapped Badass: If Xandred was to step on land, he would dry out until he died. That doesn't stop him from being the most powerful villain in the show. In "The Master Returns" Xandred was crippled with drying out yet still manages to wipe the floor with Jayden.
- Orcus on His Throne: Normally he doesn't do anything except yell at people. The Rangers don't even seemed all that concerned with him in particular even though he's supposed to be the Big Bad. This is completely in-character with his Sentai equivalent. He has gotten off his duff and attacked Deker for "meddling in his affairs" that concerned the Red Samurai Ranger, if that counts for anything and he also attacked a Nighlok who had been scheming to overthrow him.
- In "The Master Returns" we find out why he's not taken action himself: the moment he steps foot on the human world, he begins to dry out so badly it takes him out of commission for some time.
- Roaring Rampage of Revenge: After learning Serrator had been deceiving him, he comes to earth himself and proceeds to go on one of these. The only reason he didn't wipe out everyone then and there was he dries out much more rapidly than a normal Nighlok, forcing him to retreat.
- Sealed Evil in a Can: Was sealed in the river by Jayden's father. Due to the seal being done wrong (which stems from the previous Red Ranger having insufficient power at the time), it causes him headaches.
- "The Master Returns" seems to imply that he's still trapped to some degree, as flashbacks show he could previously leave the Sanzu River without drying out, a problem he has now.
- Taking You with Me: After being mortally wounded by the Samurai Megazord, he latches on to it and tries to take the Rangers with him when he explodes. It fails as while this destroys the Samurai Megazord, the Rangers survive.
- Villainous Breakdown: Nearly tears the ship apart in a blind rage when he discovers the Red Ranger is the one who sealed him away and Jayden could do it again. He gets so furious, it causes enormous numbers of Mooks to spawn and it takes a much larger dose of his "medicine" to settle him down.
Octoroo | (Voice actor: Jeff Szusterman)
Voiced by: Atsushi Imaruoka (Japanese dub)
- Badass Bookworm: He's not just Xandred's plan guy. He held his own in a straight up fight with both the Red and Gold Rangers.
- Cthulhumanoid: He looks like a cross between Cthulhu and an old man.
- Evil Genius: While Xandred is the leader, Octoroo is clearly the one who has his head straight and forms the plans. Making the Sanzu River rise was his idea to begin with.
- Rhymes on a Dime: Sometimes hand in hand with his Verbal Tic.
- Sole Survivor: The only villain to survive this season.
- Verbal Tic: Hoo-ha-hoo!
Dayu | (Voice actress: Kate Elliott)
Voiced by: Yuu Asakawa (Japanese dub)
- Adaptational Heroism: If nothing else her backstory is a lot more sympathetic than her Sentai counterpart.
- Call a Rabbit a "Smeerp": She refers to her shamisen as a "Harmonium". (A harmonium is actually a free-standing keyboard instrument, similar to a reed organ.)
- Deadpan Snarker: She tends to make a quick remark when Octoroo comes up with a plan or expresses concern for Xandred.
- Deal with the Devil: Sold her soul to save Deker's life. She wasn't told until after the deal was complete that she doomed Deker to become a half Nighlok and forget her forever.
- Despair Event Horizon: After Deker is killed for good, she loses what little hope she had left of being with him again. In response, she uses the sadness in her music to revive Master Xandred so he can destroy humanity, as she has lost everything but her status as a Nighlock.
- Don't You Dare Pity Me!: She doesn't want Mia to pity her when she finds out that Mia saw her past.
- Happily Married: She and Deker were a married couple until a fire came down and killed Deker...and now Deker doesn't remember her.
- Hidden Depths: In "There Go the Brides", she seems to have bad wedding memories that motivate her to carry out the episode's plot; and "The Blue and the Gold" and "The Tengen Gate" hint that she and Deker have some history. "Broken Dreams" expands on this. See Deal with the Devil.
- It Was a Gift: Her shamisen was originally a guitar Deker gave her as a wedding gift.
- My God, What Have I Done?: Had this reaction when she realized her Deal with the Devil turned her beloved Deker into a half human monster who will never remember her.
- No, You: Dayu gives one to Rofer early on.Rofer: Better watch what you say. If it wasn't for Master Xandred where would you be?"(Throws a knife into a wall inches from his face)Dayu: It's actually you. You should watch what you say to me. You have no right to even talk to me, you big fisted, little brain, nitwit.
- Put Them All Out of My Misery: After Deker dies.
- Screw This, I'm Outta Here!: She ditched Xandred after he abused her a little too harshly and damaged her harmonium. He later lures her back.
- Who Wants to Live Forever?: Living forever with a broken heart sucks.
- Woobie, Destroyer of Worlds: Look at Deal with the Devil and My God, What Have I Done? to see why. Yes, she's a bad guy, but she has had a seriously painful past and still genuinely loves Deker.
- She crosses the Despair Event Horizon when Deker is killed, causing her to resurrect Xandred so he can wipe out humanity. In her own words, it's because she's got nothing left but being a Nighlok without Deker.
Deker | (Actor: Rick Medina)
Voiced by: Shunsuke Sakuya (Japanese dub)
- Arch-Enemy: Jayden's, as their rivalry dominates a good portion of the plot.
- Adaptational Heroism: He's actually a good bit more sympathetic than Juzo was.
- Amnesiac Lover: Thanks to Dayu's deal with the Nighlock to save his life, he's cursed to forget that they were lovers.
- Apocalypse Maiden: Serrator turned him into a half-Nighlok because such a being was the requirement for his plan to split open the world. When he learns of this, though, he turns against Serrator.
- Blood Knight: Exists solely to find the "ultimate duel" and a Worthy Opponent.
- The Comically Serious: During his encounters with Antonio.
- Cool Sword: Uramasa.
- Disney Villain Death: At the end of his battle with Jayden, he's defeated and falls off a cliff.
- Even Evil Has Standards: His reasoning for stopping Serrator is that, while he does want to end his curse and face his Worthy Opponent, he's not going to condemn the world to a Fate Worse Than Death to do so.
- Go Out with a Smile: Dies smiling, finally at peace now that his curse is broken.
- Half-Human Hybrid: Explaining why he's able to come and go at will between Earth and the Sanzu River without drying out. He got this way by Dayu making a Deal with the Devil to save his life.
- Happily Married: He was married to Dayu until a fire broke out, killed him and Dayu sacrificed her soul for him to live...only to forget her.
- I Call Her "Vera": His sword is named Uramasa. Don't worry about remembering that, though. He tells you roughly every other line of dialogue.
- It Was a Gift: Uramasa was Dayu's wedding gift to him.
- Killed Off for Real: Eventually Jayden and Deker duel for one final time, and is defeated at the end, forever freed of his curse.
- Memento MacGuffin: Urumasa was Dayu's wedding gift to him when they were married. And he doesn't even remember.
- Noble Demon: Has a sense of honor and refuses to fight Jayden until they can have a true fight at full strength.
- The Only One Allowed to Defeat You: Towards Jayden although he isn't exactly looking to win the fight, merely to have the ultimate duel opponent. Win or lose, Deker gets what he wants.
- The Rival: Declares Jayden to be his rival in Episode 6.
- Shout-Out: He wields a reverse blade sword just like another wandering swordsman.
- Spell My Name with an "S": It's Deker, not Dekker or Decker, no matter how cool the two latter spellings may seem.
- The Stoic: Deker never seems to lose his cool.
- Tragic Villain: Dayu's attempt to save him resulted in him becoming an incurable Blood Knight constantly tormented by his blood lust. He has spent centuries searching for a Worthy Opponent to have the ultimate duel with so his suffering can end. At the same time, he's also forced to forget his wife Dayu, denying him any reprieve no matter how brief. Being so sympathetic, it is only more tragic when he can't be saved.
- You Look Familiar: Rick Medina, better known as Cole Evans.
Serrator | (Voice actor: Derek Judge)
Voiced by: Tsuguo Mogami (Japanese dub)
- Adaptational Nice Guy: Not by much and not that Serrator is a good guy or anything like at all but compared to Akumaro his Super sentai counterpart who wanted to open a portal to hell to kill everyone. His plan to flood the earth well it would have killed billions was to rule it rather than destroy it like Akumaro.
- Bad Boss: He severely injures (with him, killing Xandred) every single villain in this season.
- The Berserker: Post Villainous Breakdown.
- Catch and Return: Has a habit of catching the Ranger's Finishing Move and throwing it right back at them. In his final battle, he manages to do this to the Gigazord's Finishing Move!
- The Chessmaster: He's a very cerebral threat to the rangers, as well as a physical one.
- Deal with the Devil: The devil making the deal, in this case; he's the Nighlok who cursed both Dayu and Deker. Makes another one with them later to fix their respective items in exchange for working for him.
- Diagonal Cut: Is bisected down the middle once in his Mega Monster form, but only starts sliding apart a few seconds after the slash and gets in some last words.
- Death by Irony: As he lampshades with his dying words, he intended to split the earth in two, only for the Rangers to do it to him.
- The Dragon: Swears his loyalty to Xandred, though he's shown the occasional sign of being The Starscream. Finally, he makes his move and breaks away himself.
- Dragon Ascendant: While Xandred is temporary taken out of commission.
- Dragon-in-Chief: Takes control of the Nighlok forces for most of his tenure and is much more competent a general than Xandred bothers to be. The only catch is that Xandred remains a very, very large physical threat.
- Greater-Scope Villain: Serrator seems to be this to Xandred, due to being the Nighlok king.
- Early-Bird Cameo: Twice, oddly enough. First was in Dayu's memory/dream in "Broken Dreams", and later in the flesh in the early-aired "Clash of the Red Rangers".
- Evil Laugh: One of his favorite tropes.
- Half the Man He Used to Be: The Rangers bisect him down the middle to finish him off.
- Knight of Cerebus: The series wasn't exactly lighthearted, but Serrator and his Nighlok are even more viscious and vile than those that came before. Not only that, he's one of the most powerful enemies the Rangers have faced thus far.
- Kick the Dog/For the Evulz: In his official debut episode, "Something Fishy", in order to show his power to Master Xandred, Serrator destroys an entire army of his own moogers. Later admits to Dayu that he thoroughly enjoyed the Deal with the Devil he made with her to save Deker's life, ruining both their lives in the process.
- Mook Maker: Seems to be able to spawn Moogers, like Xandred. Can also use his claws to cut a sheet of paper into the giant Papyrax.
- Sanity Slippage: After Deker betrays him, his normal composure dissolves and he goes from a meticulous Chessmaster to The Berserker, firing randomly in all directions and single-mindedly attempting to destroy the Rangers. Even after going Mega Monster and recovering some of his composure, his voice is noticeably deeper and more unhinged.
- Slasher Smile: His only expression.
- The Starscream: He was plotting to get rid of Xandred and reclaim his place as the Nighlok king.
- This Cannot Be!: His reaction to Xandred coming to deal with him personally. Has a far more serious one when Deker betrays him.
- Villainous Breakdown: After Deker betrays him, he goes completely insane, firing randomly in all directions and his normal Evil Laugh becoming even more unhinged. While he recovers somewhat during his Mega Monster form, his voice becomes slightly deeper and more unhinged.
- Wolverine Claws: While his fingers are pretty damn sharp already, he can also enlarge his entire hands for more power, as seen in his first scuffle with the Rangers.
- BFS: Robtish, in "Test of the Leader"
- Big Eater: Two examples to date, both in Super Samurai:
- Body Swap: Switchbeast's power, though an odd variant: he prods a person and an inanimate object with his stinger-tentacles, trapping the mind within.
- Brave Scot: Robtish again
- Conservation of Ninjutsu: The Moogers' difficulty seems linked to the number of them. In "There Go the Brides", a small group of them are able to give the Samurai Megazord a good deal of trouble without a Nighlok backing them up, where the larger groups normally supporting the Nighloks are taken out much more easily.
- Covered In Slime: Antberry, to the point where it spills over to nearly everything he touches.
- Deal with the Devil: Doubletone's whole schtick is making (and later breaking) promises in exchange for his victim giving up his/her dream.
- Detachment Combat: Taken to an extreme with Splitface, who can explode into dozens of ricocheting spheres. Mike described it as being "like dodgeball with teeth".
- Dream Eater: Rhinosnorus
- Even Evil Has Standards: Sort of; Octoroo tells Dayu (and the audience) that Robtish is feared even by other Nighlok.
- Considering he fought the Red Ranger and Deker in a three way battle and held his own, it's not much of a surprise.
- Steeleto twice refers to Vulpes as his "Nighlok buddy", indicating something akin to friendship among the baddies this season.
- The Gunslinger: Dreadhead carries a Sawed-Off Shotgun
- Halloween Villain Episode: "Party Monsters", a Clip Show which focuses on the spirits of the deceased Nighloks and Moogers throwing a Halloween party and trading war stories about their battles with the rangers and how they were defeated by them.
- Hurricane of Puns: A lot of the Nighloks talk this way.
- Hyper-Destructive Bouncing Ball: Armadevil, much like Power Rangers' original super-armored armadillo monster, Soccadillo.
- Intangible Man: Dreadhead is unaffected by physical attacks.
- Magic Mirror: Vulpes uses one to screw with Jayden from the safety of the Sanzu River.
- Me's a Crowd: Duplicator, though the clones are easily dispersed by bright light.
- Mind Control: Madimot uses this on Kevin and the Tiger Zord
- Monster of the Week
- Mooks: Moogers, and as a first, Giant Moogers.
- In "Jayden's Challenge", we're introduced by Robtish to Flying Giant Moogers.
- No Name Given: The umbrella-headed Nighlok in "Forest for the Trees". SamuraiCast.com lists him as Desperaino, which is used in "Party Monsters".
- One-Winged Angel: In his second life, General Gut starts out like he looked in his first life, but when the Battlewing Megazord lands what appears to be the fatal blow on him, he goes from his overweight golden form to a much more in-shape blue form with a neck-extending serpent attached to his crotch.
- Painful Involuntary Transformation: Arachnitor, as punishment for trying to usurp Master Xandred.
- Poisonous Person: Yamiror, via toxic breath.
- Rubber Man: Rofer can stretch his arms over vast distances to punch his opponents with his Power Fists.
- Smug Snake: Madimot likes to call himself the "baddest of the bad." Needless to say, he's not as much of a threat as he believes he is.
- Smug Super: Armadeevil loves his nearly-impenetrable shell so much that he simply won't hesitate to tell you his beliefs that he's completely invincible and tell you that you lose to him, no matter what. The Rangers prove him wrong when they destroy him both times.
- General Gut loves calling himself a great leader, and it's not surprising that he's one of Master Xandred's best warriors. He even believes that the serpent attached to his groin in his One-Winged Angel form is indestructible... and the rangers prove him wrong when the Sharkzord bites it off.
- The Speechless: After Arachnitor is mutated for his treason, he lost his ability to speak, which led us to a battle almost free of wisecracking.
- Spikes of Villainy: Robtish, yet again.
- Steeleto, too, and he can use them as bladed Combat Tentacles!
- The Starscream: Arachnitor is an interesting example of a Monster of the Week that actually tried his hand at becoming Starscreamy to Master Xandred. Sadly, his attempt to overthrow him and become the new leader of the Nighloks didn't end so well for him, and he ended up being mutated through Cold-Blooded Torture as punishment for his betrayal.
- This Cannot Be!: General Gut screams this when the Sharkzord severs the serpent attached to his crotch from it.General Gut: IMPOSSIBLE! That serpent was INDESTRUCTIBLE!
- Madimot says something similar when finished off by the Tiger Drill Megazord. "I can't be beat! I'm the baddest of the bad!"
- Toilet Humor: "Moogers" looks and sounds an awful lot like "boogers", doesn't it?
- Threatening Shark: Sharkjaw, though he only appears in the very beginning of "Clash of the Red Rangers".
- Villain Has a Point: "Party Monsters" is a Halloween Episode featuring the spirits of the deceased Nighloks up to that point attending their first annual afterlife Halloween party and telling their stories to one another about their battles with the Samurai Rangers. Robtish, Negatron and Madimot all make a very good point when they point out the fact that they are all ghosts because they were all destroyed by the Rangers. Even Desperaino tells Steeleto that Madimot was right about all of them having been sent to Nighlok Heaven by them.Steeleto: Party poopers! How did we miss a monster celebration? We should remember the good times.
Desperaino: But (Madimot) has a point. This party's full of losers. All of us! Even these Moogers were sent to the afterlife by the Rangers.
Steeleto: I hate to admit it, but you're right.
- Whip It Good: Madimot uses this to order around his People Puppets, like a lion tamer.
- Words Can Break My Bones: Negatron is able to send people flying by reading their mind for their worst self-doubts and verbally insulting them.
- Youkai: The Nighloks are modeled after actual creatures from Japanese folklore.