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Sosuke Esumi/Go-on Red | Actor: Yasuhisa Furuhara
- Anime Hair
- Beauty Mark: A quite noticeable one under his right eye.
- Catch-Phrase: "Mach ______" (most frequently "Mach Speed")
- Comedic Underwear Exposure: Poor guy goes through this a lot, the most notable time being in GP15.
- Cool Sword: Road Saber
- Crouching Moron, Hidden Badass
- Disney Death: In GP 35-36.
- Dub Name Change: "Maha" in the Korean dub.
- "Freaky Friday" Flip: In GP 12, with Hatsuden (Generator) Banki.
- Friend to All Children
- Idiot Hero: Compared to the rest of the team he is by far the most dimwitted.
- Invincible Hero: Averted in GP 8 as an Aesop. While helping Speedor recover from a bad rust, Sosuke kept believing that a miracle will happen, since they're the heroes; nothing happened. In the end, he decided to make miracles happen, rather than waiting for them.
- Law of Chromatic Superiority: As per Super Sentai tradition, gets the Kankan Bar and the Ancient Engines.
- The Leader: As usual with every Super Sentai installments.
- Mr. Fanservice: Oddly enough. Throughout the season he appears in various states of undress, most of them Played for Laughs given the nature of the show.
- On the flip side, his actor, Yasuhisa Furuhara, starred in an idol DVD that plays with this trope a lot more seriously than in Go-onger itself.
- Red Oni, Blue Oni: The red to Hiroto's blue.
- During Shinkenger vs. Go-Onger, he's the red oni to Takeru's blue oni.
- Serious Business: Though not to the extent of some other Rangers, since he does it mainly as a parody of 60s' Japanese daytime dramas.
- Ship Tease: An early episode hinted that he might have romantic interest in Saki when he became worried about her spending time with a man outside the group (who, it turns out, she was asking for advice on how to defeat the Monster of the Week). He eventually gets heavy Belligerent Sexual Tension with Miu.
- Signature Move: Saber Straight
- Stock Superpowers: During the events of both Go-onger team-up movies, Sosuke uses a power that derives from the opposing team.
- Taken for Bronze: In GP 35-36. He gets better though.
- Wink "Ding!": Does this in Samurai Sentai Shinkenger VS Go-Onger right after introducing himself to the Shinkengers◊.
Renn Kosaka/Go-on Blue | Actor: Shinwa Kataoka
- Beware the Nice Ones: Ren may be sweet but is not to be trifled with, as seen during GP 25 when he defends a Gaiark that he had believed for years was a sacred family statue, and in GP 35-36 following Sosuke's Disney Death
- The Big Guy
- Catch-Phrase: "Just..."note
- Genius Bruiser
- Hand Cannon: Garage Launcher
- Ki Attacks: On On Dan, during the events of Go-onger vs. Gekiranger.
- Missing Mom: GP 25 reveals that Ren's mother was terminally ill and died when he was a very young child.
- Signature Move: Launcher Starter
- The Smart Guy: The smartest among the crew.
- Team Mom: His teammates even call him "Mother".
- Verbal Tic: Adds "-su" to the end of sentences - except when at home
Saki Royama/Go-on Yellow | Actor: Rina Aizawa
- Idol Singer: GP 11 shows that this is a secret dream of hers. In GP 31, she forms an idol group (G3 Princesses) with Miu and Kegareshia in order to defeat a MOTW that functions on sound waves.
- Image Song: "Smile Smile"
- Improbable Weapon User: Racing Bullet
- Ki Attacks: V V Dan, during the events of Go-onger vs. Gekiranger.
- Meaningful Name: "Saki" means "blooming" in Japanese, which relates to her title, "Smile Blooming."
- One Note Chef: She's good at making sweets and cakes, but not much else...
- Sibling Yin-Yang: In GP 34, with her sister, who turns out to be the polar opposite of Saki.
- Signature Move: Bullet Crash
- The Smurfette Principle: Up until GP 17.
- Tomboy and Girly Girl: Girly Girl to Miu's Tomboy.
Hant Jo/Go-on Green | Actor: Masahiro Usui
- An Axe to Grind: Bridge Axe
- Catch-Phrase: "Doki Doki"
- Chivalrous Pervert: Tends to get attracted to beautiful women he comes across and tries to protect them.
- Dub Name Change: "Jyo" in the Korean dub.
- Keet: Like Saki, he has a joyful mood.
- Ki Attacks: Baru Baru Dan, during the events of Go-onger vs. Gekiranger.
- New Job as the Plot Demands: Frequently seen taking various part-time jobs, with his commitment to being a Go-Onger affects his job security.
- Sensitive Guy and Manly Man: Sensitive Guy to Gunpei's Manly Man.
- Ship Tease: It's occasionally hinted that Hant has a crush on Kegareshia (in GP 14 he falls for her while she is disguised as "Rena", and in other episodes he seems to find her attractive even in her usual form).
- Signature Move: Axe Touring
- Wholesome Crossdresser: In at least two episodes. Later, in GP 47 Gunpei wants Hant to dress as a girl and pose for fake wedding photos to deceive Gunpei's mother, despite the presence of two actual women on the team.
Gunpei Ishihara/Go-on Black | Actor: Kenji Ebisawa
- Badass Longcoat: Subverted For Laughs. Donning a trenchcoat led him to be mistaken for a drug dealer.
- Butt-Monkey: Eventually took the role from out of Hant's hands.
- By-the-Book Cop
- Cloud Cuckoolander: Somewhere down the road, a few brain cells dropped dead. By Shinkenger vs. Go-onger, any sanity he might have had left was apparently on vacation.
- Cool Gun: Cowl Laser
- Dub Name Change: "Alex" in the Korean dub.
- Jumped at the Call: Desperate to become a Go-onger to the point of stealing the Engine Casts. It's only when he agrees to hand them back that Bomper decides Gunpei has a strong sense of justice, and allows him and Hant to become Go-on Black and Green.
- Ki Attacks: Ganga Ganga Dan, during the events of Go-onger vs. Gekiranger.
- Real Men Hate Sugar: Subverted; after having a taste of a cake that Saki made (after Sosuke declared it to be delicious), he eagerly took a piece, saying, "I don't like sweets, but I'll have this."
- In the finale, he tells Saki that he looks forward to the day when she opens her own cake shop. YMMV whether he has developed an appreciation for Saki's cakes and sweets, or if he is merely being a supportive friend.
- Sensitive Guy and Manly Man: Manly Man to Hant's Sensitive Guy.
- Serious Business: When he starts interrogating the employees at Ren's inn to learn about his past with the petrified Banki shrine, you know a line is being crossed.
- Terrible Artist: He is terrible at drawing. In GP 16, we see his drawing of a penguin, which looks like anything but.
Hiroto Suto/Go-on Gold | Actor: Hidenori Tokuyama
- Aloof Ally: Initially.
- The Ace: One episode has a bunch of Hiroto's groupies saying he could master anything if he wasn't devoting his time to fighting Gaiark.
- The Comically Serious: Even when fully joining the rest of the team, he still tries to distance himself from their sillier antics.
- Dub Name Change: "Hiro" in the Korean dub.
- Jerk with a Heart of Gold: Incredibly Lame Pun aside, his attitude doesn't prevent him from aiding his sister and friends.
- Knife Nut: Rocket Dagger
- Meaningful Name: "Hiroto" uses the characters for "big wings", relating to his theme as a Go-on Wing.
- Red Oni, Blue Oni: The blue to Sosuke's red.
- The Rival: To Sosuke.
- Signature Move: Burning Dagger
- Sixth Ranger: Along with Miu.
- The Stoic: but Not So Stoic if Miu is in danger and if ghost are present.
- Spotlight-Stealing Squad: He and Miu got a lot of screentime for just two people. Justified because the Wings function as a separate unit from the Go-ongers.
- Why Did It Have to Be Snakes?: Ghosts are what he is scared of. This was foreshadowed in the Urameshimedes episode, and confirmed as canon down the line.
- Team Dad: An incident with a monster from the Sound World has him being labeled as the "Father" of the team, much to his chargin.
- I Work Alone: Initially. He later warms up to the rest of the team, but he and Miu live separately from the Go-ongers.
Miu Suto/Go-on Silver | Actor: Yumi Sugimoto
- All Girls Want Bad Boys: While Sosuke is brainwashed in the Straw Banki episode, he begins acting like a gangster/Yakuza and offers Miu a stolen ring, which makes her happy. Later, after he has returned to normal, she admits that she preferred him brainwashed.
- Aloof Ally: At first like her brother, but she warms up to the Go-ongers much faster than Hiroto does.
- Belligerent Sexual Tension: With Sosuke.
- Dub Name Change: "Miwoo" in the Korean dub.
- Image Song: "Dream Wings"
- Knife Nut: Rocket Dagger
- Meaningful Name: "Miu" uses the characters for "beautiful wings", relating to her theme as a Go-on Wing.
- Not So Above It All: While Hiroto still tries to maintain a serious attitude, Miu will gladly join the rest of the Go-ongers' antics despite her initial reactions.
- She's Got Legs: And complete with really short shorts to show them off.
- Ship Tease: With Sosuke.
- Signature Move: Freezing Dagger
- Sixth Ranger: Along with Hiroto.
- Tomboy and Girly Girl: Tomboy to Saki's Girly Girl.
In GeneralThe partners of the Go-Ongers, hailing from the Engine World. In order to survive on Earth they need to separate into Engine Casts, miniature versions of their true Engine forms, and Engine Souls, which are cartridge-shaped objects that store the soul of an Engine. When the Engine Casts are reunited with the Engine Souls, the Engines are brought back to full size for ten minutes, after which they risk rusting.
- Animal Mecha: Mixed with Cool Car (for Speedor, Bus-on, BearRV, Gunpherd, and Carrigator), Cool Bike (Birca), Cool Plane (Toripter, Jetras, and Jumbowhale), or Cool Train (Prehistoric Engines).
- Ridiculously Cute Critter: Their chibi holographic projections.
- Roger Rabbit Effect: Even as holograms, their cartoony forms clash against the live action environment.
- Sentient Vehicle: Their true forms are giant-sized.
- Sleep-Mode Size: Engine Casts.
- Soul Jar: Engine Souls.
- Verbal Tic: Either a syllable of their respective names or an associated onomatopoeia. Even the non-speaking Prehistoric Engines have their roars counted as these by their verses in the ending.
Speedor | Voice actor: Daisuke Namikawa
- Flying Car: Accel Full Throttle
- Noble Bird of Prey: Based on a condor.
- Shout-Out: He's a Highway Star.
- Verbal Tic: Dor/Drrr!note
Bus-on | Voice actor: Hisao Egawa
BearRV | Voice actress: Miki Inoue
- Beary Friendly: Averted if you're a Gaiark cohort or ticked off, but otherwise played straight.
- The Smurfette Principle: The only female Engine to have a major role in the series.
- Verbal Tic: V!
Birca | Voice actor: Soichiro Hoshi
- Cool Bike: A motorcycle, honestly.
- Gratuitous Foreign Language: He likes peppering his speech with words from various Romance languages.
- Mecha Expansion Pack: Spinning Blade Below the Shoulder
- Smart Whales: Based on an orca.
- Verbal Tic: Baru!
Gunpherd | Voice actor: Kenji Hamada
Carrigator | Voice actor: Kyousei Tsukui
- Never Smile at a Crocodile: Unless you're his ally.
- Stealth Pun: Carrigator is pronounced "kari-geta", a reference to his role as the "shoes" of EngineOh formations from G6 and up.
- The Big Guy: Even among the Engines, he's part of the Gian Race.
- Verbal Tic: Geta!
Toripter | Voice actor: Shizuka Ishikawa
- Clucking Funny: Based on a chicken.
- Helicopter Blender
- Larynx Dissonance: Was a cause of confusion over Toripter's gender.
- Verbal Tic: Bata!
Jetras | Voice actor: Kiyotaka Furushima
- Panthera Awesome: Based on a tiger, fitting on how that his animal is called tora.
- Verbal Tic: Giin!
Jum-bowhale | Voice actor: Tomomichi Nishimura
- Badass Grandpa: The oldest among the Engines.
- Badass Mustache: Only present on his chibi form.
- Nice Hat: A commercial airline pilot's hat, only visible on his chibi form.
- Space Whale: Heís part jumbo whale.
- Verbal Tic: Boe!
- All There in the Manual: He gets more characterization on his minute-long ending verse than on the show proper.
- An Ice Person: Can freeze enemies.
- Cool Train: It's a steam locomotive.
- Mythology Gag: A mammoth-based mecha grouped with Stock Dinosaurs and able to snort freezing breath through its trunk. It's certainly not the first.
- The Speechless: Does not speak, along with T-Line and K-Line.
- Verbal Tic: For lack of any, his ending counts his trumpeting as "pao!".
- All There in the Manual: Same as Kishamoth.
- Cool Train: A bullet train.
- Dumb Muscle: Implied through said All There in the Manual, where he's described as being the most primitive.
- Man Bites Man: He has teeth, obviously, that can bite foes.
- Satellite Character: Justified since it is one of Kishamoth's cars.
- The Speechless: Does not speak, along with Kishamoth and K-Line.
- Tyrannosaurus rex: Part of his motif.
- Verbal Tic: For lack of any, his ending counts his roaring as "gao!".
- All There in the Manual: Just like his buddies.
- Cool Train: Like T-Line, a bullet train.
- Engine Bites Enemies: Though it only happened once as a double attack with T-line.
- Nature Lover: Implied through the ending.
- Satellite Character: Justified since it is one of Kishamoth's cars.
- Stock Dinosaurs: of the Triceratops variety.
- The Speechless: Does not speak, along with Kishamoth and T-Line.
- Verbal Tic: For lack of any, his ending counts his roaring as "gyao!".
Barbaric Machine Clan Gaiark
Earth Pollution Minister Yogostein | Voice actor: Kiyoyuki Yanada
- Benevolent Boss: Unlike most Sentai Big Bads, he actually treats his subordinates rather well.
- Big Bad: The de facto leader of the three Ministers and the one who usually formulates the Evil Plan.
- Disc-One Final Boss: Gets killed about two thirds of the way through. He is later replaced by Kireizky and finally, his father, Yogoshimacritein.
- Character Death: Gets killed at the end of GP 36. He came back in Samurai Sentai Shinkenger vs. Go-Onger, however.
- The Dragon: Was reporting to his father all along.
- Even Evil Has Standards: He (along with the rest of the Gaiark) make every attempt to stop the MOTW in Episode 31.
- In-Series Nickname: "Yogostein" is his nickname. His full name is Baron Yogorex de Stein.
- Meaningful Name: His name is derived from "Yogosu", meaning "Pollute".
- One-Winged Angel: Uses Horonderthal to upgrade himself in GP 35 and 36.
- Verbal Tic: "-Nari"
Earth Pollution Vice-Minister Hiramechimedes | Voice actor: Kazuya Nakai
- Accidental Misnaming: Ren is the only Go-onger able to remember Hiramechimedes' name correctly.
- Catch-Phrase: "Pok-pok-ping!"
- Deader Than Dead: Gets exorcised as a ghost.
- Determinator: He just won't give up, even after death.
- The Dragon: As Land Pollution Vice-Minister, he is this to Yogostein
- Evil Genius: He's both The Strategist and the inventor of the Gaiark.
- Four Eyes, Zero Soul: For some reason he wears glasses anytime he's outdoors.
- Idea Bulb: Literally. He actually has a trio of lightbulbs built into his head that light up whenever he has an idea.
- Insufferable Genius: Feels disrespected whenever people don't acknowledge his brilliance.
- Meaningful Name: A combination of "Hirameki" = "Flash" ie. an idea, and Archimedes, tying him to his mathematics and strategy themes.
- Urameshimedes is "Urameshiya" = literally an expression of envy, but the connotations are essentially the same as shouting "Boo!" + Archimedes.
- One-Winged Angel: Overloads himself with Psycho Serum to overpower the Go-Ongers in GP 23
- Only Mostly Dead: His grudge against the Go-ongers enables him to return as a yureinote , the undead Urameshimedes
- Overly Long Name: Hilariously, itís even difficult to pronounce.
- The Starscream: Originally plotted to assassinate Yogostein and take his position, but later swore loyalty to him after he offered him a position as his second-in-command.
- Undying Loyalty: Pledged complete loyalty to Yogostein after he named him his Vice-Minister.
- Yes-Man: To Yogostein, but he's a sincere version.
Water Pollution Minister Kegalesia | Actor: Nao Oikawa
- Dark Chick: Of the three Pollution Ministers.
- Enemy Mine: To the Go-onger girls during GP 31, though she makes it clear they will be enemies again next time.
- Image Song: Taoyuan aka "Utopia"
- High-Pressure Emotion: When she feels frustration she literally leaks steam
- Meaningful Name: "Kegare" = "Impurity"
- Paper-Thin Disguise: Is somehow able to successfully pass as a human despite the giant tap on her head.
- Robot Girl: She resembles a human, but is artificial like the rest of the Gaiark.
- The Smurfette Principle: Zigzagged. A handful of episodes feature other female Bankis.
- Stripperiffic: Although hardly the same level as Shelinda.
- Verbal Tic: "(De) ojaru"
- Whip It Good: Her primary weapon, the Kegastick, can be used as a whip.
Air Pollution Minister Kitaneidas | Voice actor: Mitsuaki Madono
- Meaningful Name: "Kitanai" = "Foul"
- Even Evil Has Standards: Of particular note during GP 31, where he (along with his Gaiark colleagues) attempts to stop the MOTW. He gets special mention for explaining that they only want to dirty the world, not destroy it.
- Out of Focus: Fades into the background in a lot of episodes.
- Verbal Tic: "-zoyo"
Cleaning Minister Kireizky | Voice Actor: Eiji Takemoto
- Big Bad: He comes in to lead the Pollution Ministers following Yogostein's demise. He holds onto this role for all of two episodes and later turns out to be a subordinate to Yogoshimacritein.
- Chekhov's Gun: The Infinite Wastebin, which Yogoshimacritein uses to arrive in Human World.
- Disc Two Final Boss:
- Filler Villain: His only important impacts on the plot are being revealed to have the ability to "clean" Braneworlds and having the Infinite Wastebin.
- Knight of Cerebus: His arrival signals the start of when the show gets serious. Less so than Yogoshimacritein, but still much darker and formidable than the main three ministers.
Prime Minister Yogoshimacritein | Voice actor: Kiyoyuki Yanada
- Abusive Parents: Denounced his son as a useless failure following his death.
- Always a Bigger Fish: [[spoiler:Overshadows Yogostein and Kireizky as the highest-ranked Gaiark member seen in the series, though its revealed in the final episode that even he has a boss.
- Bad Boss: In contrast to his son, Yogoshimacritein showed no care towards his minions and even fired the two remaining Pollution Ministers to hit the Go-ongers.
- Big Bad: Following the deaths of Yogostein and Kireizky, Yogoshimacritein steps in and becomes the ultimate foe of the Go-ongers.
- Evil Chancellor: His title is "Prime Minister", implying he fills this role within the overall Gaiark hierarchy.
- Greater-Scope Villain: Despite being the ultimate foe of the series, he remains distant from the main plot until after Kireizky's death..
- Knight of Cerebus: Is significantly more serious and dangerous than the other often goofy villains.
- The Man Behind the Man: Yogostein and Kireizky were working for him all along.
- Verbal Tic: "-Narina"
Pollution President Batcheed | Voice actor: Banjo Ginga
- Big Bad: Of Shinkenger vs. Go-onger
- Greater-Scope Villain: The true leader of the Gaiark, above even Yogoshimacritein. He only gets mentioned in the final episode as the missing President of Gaiark who was hidden in Cowboy World.
- The Man Behind the Man: He's effectively Yogoshimacritein's boss.
- Verbal Tic: "-de aru"