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- Critical Annoyance: Like most Ultramen, the Color Timer on Tiga's chest flashes red and beeps as he runs low on energy.
- Did You Just Punch Out Cthulhu?: All the Ultramen do this, but Tiga should get a special mention because the Big Bad of his series is none other than Cthulhu's son!
- Empty Shell: The statue inside the pyramid is this, as the real Tiga departed it long ago, leaving it open for Daigo to possess.
- Finishing Move: Each of his forms has a separate one — Multi Type uses the Zepellion Ray, Power Type has the Delacium Light Stream, Sky Type possesses the Rainbalt Light Bullet.
- Heel–Face Turn: In The Final Odyssey, it is revealed Tiga used to be evil and worked alongside the Dark Giants as their most powerful member during a civil war between Ultramen that almost destroyed the 30-million-year-old civilization they protected. However, in his human form, he fell in love with Yuzare, who managed to turn him to the side of light and allowed him to seal his comrades away in stone.
- Legacy Character: Uniquely, Tiga is this. Over the course of his own series, there have been at least four separate Tigas all in the same bloodline: the original Ultraman Tiga who was the actual Giant of Light, Amui (who is implied to be Daigo's ancestor), Daigo, and Daigo's son Tsubasa.
- Light Is Good: As a being of light.
- Dark Is Not Evil: In Ultraman: The Final Odyssey, he becomes Dark Tiga this when Camila convinces him Daigo become Tiga again. However, Daigo embraces both the goodness in his heart to control the evil within himself, preventing Tiga from succumbing to his old ways.
- Love Redeems: His feelings for Yuzare is what made him change sides from darkness to light.
- Meaningful Name: "Tiga" means "three" in Malay, referencing his Multiform Balance.
- Multiform Balance: The first Ultra Series hero with such an ability.
- Purple Is Powerful: One of the few Ultramen with purple as a major part of his colour scheme.
- Sealed Good in a Can: Daigo discovered him as one.
GUTS (Global Unlimited Task Squad)
The defense division of the Terrestrial Peace Consortium (TPC).
The GUTS team
- Played by: Hiroshi Nagano
- Earn Your Happy Ending: After all the crap he goes through and battles he fights, he's notably one of the very few Ultras to actually get to retire after his line of duty as Earth's guardian is over. He retires with his wife Rena, and as shown in Dyna, goes on to live a happy life on Mars with two kids.
- Half-Human Hybrid: The reason why he is able to become Ultraman Tiga is because he is both "a human and a being of light".
- Retired Badass: One of the very few Ultras to actually retire. He's still a combat trained officer and it's implied he can turn into Tiga again but is content in his retirement. All other appearances by Tiga after his series ends are either his Alternate Self, another person using the mantle, or an Alternate Self of the original Tiga.
- The Hero: Well, he is the guy who turns into Ultraman Tiga, isn't he?
- Transformation Trinket: The Spark Lens.
- Played by: Takami Yoshimoto
- A Day in the Limelight: "The Man who Fell to Earth", "SOS from the Deep Blue Sea", and "Monster Zoo".
- Ace Pilot: She's incredibly good with planes and is often the one chosen whenever GUTS is using their fastest or strongest aircraft in the episode.
- Action Girl: She's no Bridge Bunny, unlike the female members of defense teams before her.
- The Lancer: To Daigo.
- Official Couple: With Daigo in the post-series films.
- Parental Abandonment: In episode 7, it's revealed her father ran away to the GUTS space station after promising some lipstick for her birthday.
- Secret Secret-Keeper: Of course, that went out the window when Tiga lost against Gatanozoa the first time.
- Played by: Mio Takagi
- A Day in the Limelight: "The Devil's Judgement" and "The Mirage of a Monster"
- The Captain: Of GUTS. Notable for being the first female leader in the Ultra Series.
- Supporting Leader: She rarely comes out on the field, usually ordering from base while Munakata leads the rest on the frontlines.
- Team Mom: Whereas most other team leaders are A Father to His Men.
- Played by: Akitoshi Ohtaki
- A Day in the Limelight "The Day the Monster Appeared" and "Vampire City"
- Guy in Back: He gives commands while sitting at the back of the jet.
- Number Two: To Iruma.
- The Teetotaler: Orders milk at the bar, even when Iruma's buying! This is because his actor happens to also be a teetotaler.
- Played by: Yukio Masuda
- A Day in the Limelight: "Requiem to Darkness", "A Fog is Coming!", and "Goodbye to Darkness"
- The Comically Serious: Has his moments.
- Gadgeteer Genius: He makes all sorts of gadgets against kaiju and aliens. One of his most useful is a tracking device that has helped out GUTS quite a few times against the Monster of the Week.
- Kansai Regional Accent: Speaks with one.
- The Smart Guy: Shared with Yazumi.
- Played by: Shigeki Kagemaru
- A Day in the Limelight: "The Closed Amusement Park", "Human Collecting", and "A Friend from Space"
- Big Brother Instinct: Although he sometimes seems tiresome of his sister's worrying, he is quite protective of her and tries his best to keep her happy.
- The Big Guy: Plays this role in the team.
- Played by: Yoichi Furuya
- A Day in the Limelight: "One Vanishing Moment", "The Time-Transcending Smile", and "The Town Where the Girl Disappeared"
- Beta Couple: With Nurse Mayumi from Episode 28 onwards.
- Mission Control: The first male example in the franchise.
- Non-Action Guy: He doesn't normally get to come out on the field and usually just analyzes the monster from the safety of headquarters with Iruma.
- Teen Genius: He's only eighteen, but is the smartest guy on the team asides Horii. He created his own search engine and programmed GUTS' nigh-invincible firewalls.
Other GUTS Members
General Soichiro Sawai
- Played by: Tamio Kawachi
- A Day in the Limelight: "To the Southern Limit", shared with Yoshioka.
- Big Good: He's probably the most important man on the planet, given that he's both head of its global defense force and of its diplomatic peacekeeping organization.
- The Kirk: To Yoshioka's Spock and Nahara's McCoy.
- Reasonable Authority Figure: Of the top three men at TPC, he provides the middle ground.
Security Director Tetsuji Yoshioka
- Played by: Ken Okabe
- Jerk with a Heart of Gold: Despite his highly militaristic nature, he is shown to be a loyal friend of Sawai, has shown to be quite friendly with GUTS at times, and was even willing to sacrifice his life to save TPC's base from Gatanozoa.
- The Spock: To Sawais' Kirk and Nahara's McCoy
- War Hawk: He's usually suggesting to take on any crisis with swift military action, but in a more positive spin, he also knows when it would be stupid to do so and will back down if a less violent and more effective alternative is put forth.
Staff Officer Masayuki Nahara
- Played by: Take Uketa
- The McCoy: And he frequently locks horns with Yoshioka as a result.
- Out of Focus: Gets the least attention of the top three leaders at TPC.
Nurse Mayumi Shinjoh
- Played by: Kei Ishibashi
Dr. Naban Yao
- Played by: Ichiro Ogura
Professor Yuji Tango
- Played by: Yoichi Okamura
Monsters and Aliens
Golza / Fire Golza
- First Appearance: The One who Inherits the Light
- Art Evolution: As Fire Golza, the white spots on his body are now red and there are several vein-like growths covering his skin.
- Breakout Villain: As the most popular Ultraman Tiga kaiju, Golza is one of the few to have regular reappearances and the opportunity to battle other Ultramen.
- Everything's Better with Dinosaurs: Stated to be a "Super Ancient Monster" and greatly resembles one.
- The Juggernaut: Especially noticeable in Ultra Galaxy, but even in its original appearance, Fire Golza was pretty damn durable, completely ignoring most of Tiga's punches and beam attacks.
- Last of His Kind: Implied. A flashback in The Final Odyssey shows multiple Golzas fighting numerous Ultramen, suggesting the one in the series may be a survivor.
- Magma Man: Golza becomes Fire Golza by absorbing lava. No word about if Melba can do similar things.
- Mighty Glacier: Slow but brutish, in comparison to the more agile but easily destroyed Melba. Moreso as Fire Golza naturally.
- Playing with Fire: As Fire Golza, its head laser is replaced with fireballs.
- Prehistoric Monster: Along with Melba.
- Purple Is Powerful: Is able to shoot an ultrasonic ray of purple energy from his forehead.
- Signature Roar: A loud guttural growl followed by a high-pitched screech.
- Starter Villain: Marking the beginning of a new era for the Ultra Series.
- Took a Level in Badass: As Fire Golza, he absorbed so much heat it gave him a new set of fiery powers, and was only killed once and for all when Tiga hurled him into an erupting volcano. And even then, he somehow returned in Ultraman Dyna.
- Tunnel King: Burrows about rapidly, travelling from Mongolia to Japan in a matter of hours.
- Volcanic Veins: As Fire Golza.
- First Appearance: The One who Inherits the Light
- Eye Beams: It's primary ability.
- Fragile Speedster: In comparison to Golza's Mighty Glacier.
- Giant Flyer: It's a kaiju, and all that.
- Our Dragons Are Different: It's title is "Super Ancient Dragon" and it certainly resembles one with pterosaur features.
- Prehistoric Monster: Both Melba and Golza are creatures from ancient times.
- Sinister Scythe: Has huge sickle-like middle claws.
- Starter Villain: Along with Golza, although Melba didn't escape the battle.
- First Appearance: Legend of the Stone
- Breath Weapon: They breathe a beam of energy that encases victims in stone.
- Eat Dirt, Cheap: They consume minerals, but when miners dug up all their food supply, they started attacking them.
- Shock and Awe: Both monsters can channel electricity through their bodies, which one of them uses to stop Tiga from trying to rip its horns out.
- Taken for Granite: Their Breath Weapon encases victims in stone.
- Tunnel King: Both monsters were proficient burrowers.
- First Appearance: The Devil's ProphecyVoiced by: Masaharu Sato
- Ancient Evil: So ancient that not even those from Tiga's period know their origins!
- Back for the Finale: A pair of Kyrieloids taunt Daigo while Tiga is petrified by Gatanozoa, mocking how humanity should have become subjugated by them if they wanted to be saved and adding that they have dedcided to leave the doomed planet.
- Beneath the Earth: In the 4Kids dub, they hail from the Earth's core, whereas the original Japanese version left it mysterious.
- Dead Person Impersonation: The first Kyrieloid takes the form of the late Mitsuo Itahashi to spread its prophecies.
- Demonic Possession: They perform this one a TV show host to announce their coming.
- Dub Name Change: In the 4Kids dub, they're called the Kilaliens.
- Eyeless Face: Unless that glowing organ on the forehead is supposed to be an eye.
- Humanoid Abomination: A race of impossibly ancient demon-like beings that see themselves as the prophets of the human race and seek to "purify" them.
- Mind over Matter: Possesses telekinetic powers.
- Multiform Balance: The second Kyrieloid possesses the Power Type and Sky Type morphing abilities of Ultraman Tiga.
- Our Demons Are Different: The series frequently compares them to devils and they are capable of many demon-associated abilities like possessing people and controlling fire.
- Playing with Fire: Able to channel the heat from the Earth's core into eruptions of flame capable of destroying a skyscraper.
- Pokémon Speak: Kyrieloid only "speaks" by saying "kiri" in repetition.
- Spell My Name with an "S": Has a variety of other names include Kilie, Kilalien, and Kilielu.
- Ultraterrestrials: Implied.
- First Appearance: Sayonara, Earth
- The Assimilator: Absorbs matter into its naturally incorporeal form to become a monster.
- Assimilation Backfire: GUTS is able to defeat it by communicating with the astronauts, paralyzing Ligatron as the human minds rebel against the cyborg's programming.
- Blade Below the Shoulder: Possesses vicious blades for hands.
- Cyber Cyclops: Has a single yellow eye able to fire flashes of energy that cause explosions or hack into computers to assimilate data.
- Energy Absorption: Ligatron consumes energy to fuel its spaceship body.
- Energy Being: Its true form is an entity composed of bright light.
- Hand Blast: Ligatron can fire a blue laser bu putting its blade-claws together.
- First Appearance: The Day the Monster Came Out
- Breath Weapon: Breathes toxic gas.
- Healing Factor: Constantly regenerates itself, even when GUTS melted its skin and flesh off!
- Long Neck: Possesses the weird ability to stretch out its neck to strike at foes.
- Our Zombies Are Different: Sealizar was first discovered as a corpse, but of what variation is unclear as it is never seen alive.
- Sea Monster: As you can tell by its name, and judging from the fact that it first appeared washed up on a beach from somewhere under the ocean.
- First Appearance: Second Contact
- Blue and Orange Morality: GUTS discovers this when they attempt to communicate with it, as its understanding of the concept of friendship is very different from humans.
- Breath Weapon: Spits purple orbs of explosive plasma energy.
- Psychopathic Manchild: Although it's a kaiju, Gazote gives off these vibes due to the young voice GUTS hears from it in their translator, inability to comprehend human ideas of friendship, and the fact that its roar is made from modified baby cries.
- Spell My Name with an "S": Also spelled "Gazort" or "Gazoto".
- To Serve Man: Likes to eat humans, or as it calls them, "friends".
- Worm That Walks: It's a mass of tiny flying creatures native to the ionosphere.
- First Appearance: The Man who Fell to Earth
- Dirty Coward: Abandoned its friends and family aboard a spaceship that was about to be destroyed when an assault on TPC's space station went south.
- Faux Affably Evil: Plays victim to deceive GUTS and TPC during its botched attacked on their space station.
- Playing with Fire: Can shoot fireballs from its hands.
- Starfish Aliens: Although it has two limbs and two legs, its body shape is very abstract.
- First Appearance: Halloween Night
- Adult Fear: Gives out drugged candy on Halloween and kidnaps the children who take it.
- All Hallows' Eve: Not only does Giranbo only appear on Halloween night, it takes the form of an old lady in a witch costume and transports kidnapped children to its home dimension in a vehicle resembling a giant jack-o-lantern!
- Doppelgänger Spin: Uses this to try confuse Tiga during the fight.
- Dream Eater: Consumes the dreams of children, turning them into emotionless zombies.
- Humanoid Abomination: A monster witch from a dimension called the Graveyard of Dreams, where it brings the children it's kidnapped to feed on their dreams and turn them into joyless pawns.
- Mind Control: Any child who takes her drugged candy falls victim to this, making it easy for Giranbo to capture them.
- Missing Reflection: In human form, Giranbo casts no reflection, which Daigo notices and motivates him to track the witch.
- Spell My Name with an "S": Also called Gilanbo.
- Teleport Spam: Another trick it tries on Tiga.
- First Appearance: The Girl who Waited for a Monster
- Attack Reflector: Makeena's bodily appendages are highly reflective, rendering beam attacks useless against it, especially when it enters its shell form.
- Non-Malicious Monster: The first Tiga kaiju that had no intention of destroying Earth. It was an escort for Saki to bring her back to her homeworld.
- First Appearance: The Closed Amusement Park
- Barrier Warrior: Creates an impassable wall of energy with its horn.
- Expy of Gudon in appearance.
- Horn Attack: After Tiga destroys its whips, Gagi begins to rely on its horn, firing beams and trying to gore Tiga with it. Of course, Tiga just karate chops it off.
- Whip It Good: Possesses retractable whip-like middle fingers.
- The Worf Effect: In its reappearance against Silvergon, where Silvergon literally smashes its way through Gagi's barrier to demonstrate its herculean strength to viewers.
- Would Hurt a Child: Targeted children because the growth hormones in their bodies were particularly nutritious for its children.
- First Appearance: Requiem to Darkness
- Alas, Poor Villain: Horii and Ryosuke's girlfriend Sayaka when they realize Ryosuke's reasons for becoming Evolu.
- Energy Absorption: Evolu must sustain himself by consuming electricity, or else he dies. So Ultraman Tiga defeats him by simply making sure Evolu cannot absorb electricity and trying to outlast him until he eventually runs out of energy and dies as Ryosuke.
- Shock and Awe: Can shoot lightning bolts from his hands.
- Superpowered Evil Side: Ryosuke lived in a constant state of torment between remaining human and metamorphosing into Evolu due to this.
- Tragic Monster: Ryosuke only transformed himself into Evolu because, despite his genius, he was so insecure about his human fallibility that he sought to become the perfect lifeform.
- Whip It Good: Has retractable whips in his palms, which can also channel electricity.
- First Appearance: S.O.S. from the Deep Blue Sea
- Breath Weapon: Can spit electrified bubbles.
- Fighting Clown: Despite being a destructive colossus, Leilons is pretty playful and acts rather goofily during the fight, even laughing at Tiga whenever he gets hurt.
- Friendly, Playful Dolphin: Its motif.
- Making a Splash: Can spray high pressure water from its mouth.
- Nuclear Nasty: Was originally some kind of sea creature (possibly a dolphin), but turned into a kaiju by nuclear waste.
- Sea Monster: Based on dolphins in appearance and attitude.
- First Appearance: Human CollectingVoiced by: Hirohiko Kakegawa (leader), Masaharu Sato (lackeys)
- Bird People: The 4Kids dub says they originate from the Crow Nebula.
- Creepy Crows: Sinister crow-faced aliens.
- Eye Beams: The head Raybeak was shown using these to battle Ultraman Tiga.
- Glowing Eyes of Doom: The bright, orangey eyes of the subordinate Raybeaks.
- Red Eyes! Take Warning: The Raybeak leader.
- Shrink Ray: Their weapon of choice.
- Slavery Is a Special Kind of Evil: They specialize in slavery, as on their home planet, they have enslaved a coexisting race of Human Aliens and treat them so badly that the slaves had to be replaced them with Earthlings.
- First Appearance: The Released TargetPortrayed by: Masaharu Sato (alien form voice), Tenmei Basara (human form actor)
- Evil Laugh: The only sounds that ever come from his mouth are grunting laughs.
- Horn Attack: Has a single tiny horn of his head that shoots lasers, both in normal and kaiju form.
- Hunting the Most Dangerous Game: His goal.
- Insectoid Aliens: Somewhat resembles a humanoid beetle, especially in kaiju form.
- Long Neck: His kaiju form's four-legged mode has one.
- One-Winged Angel: When GUTS attacks him, he transforms himself into a kaiju-sized version of himself that possesses the ability to switch between a bipedal and quadrupedal mode.
Rucia & Zara
- First Appearance: The Released TargetPlayed by: Asami Katsuragi (Rucia), Shogo Shiotani (Zara)
- Alien Blood: Both have green blood.
- Human Aliens: Specifically slaves of Alien Muzan released to be hunted for sport.
- The Quiet One: Neither of them say very much due to the fact that they're incapable of speaking Japanese/English.
- First Appearance: The Demon's Return
- Bilingual Bonus: Its name essentially means "One-Eyed Ogre".
- Breath Weapon: Two actually.
- Cyclops: Has one eye on both of its faces.
- Losing Your Head: Ultraman Tiga finds this out when he decapitates Sakuna Oni. Fortunately, Kagetatsu's sword manages to finish it off.
- Off with His Head!: Has the notable honour of being the last Ultra monster in the franchise to get decapitated.
- Oni: A legendary demon sealed away centuries ago by a great warrior.
- Pulling Themselves Together: Due to the fact that Kagetatsu split each of its body parts up when he buried them, Sakuna Oni's first act upon having its tomb's seal broken is to get itself back together, resulting in gigantic arms and legs popping up around the countryside.
- Sealed Evil in a Can: The power of Kagetatsu's sword was what prevent his body from reattaching itself together until it was stolen.
- Two-Faced: Sakuna Oni usually hides the second face underneath its hair.
Alien Standel Abolubas and Redle
- First Appearance: Red and Blue's BattleVoiced by: Kozo Shioya (Abolubas), Tomohisa Aso (Redle)
- Achilles' Heel: Abolubas is weakened by daylight while Redle is weakened by the darkness of the night.
- Casting a Shadow / Light 'em Up: Once again, Abolubas and Redle respectively.
- Dark Is Evil / Light Is Good: Abolubas and Redle respectively.
- Expy: Inspired by Aboras and Banila, as well as Alien Mysteler.
- Red Oni, Blue Oni: Abolubas is the blue while Standel is the red. In fact, their whole planet is literally divided by such.
- Shock and Awe / Playing with Fire: Abolubas and Redle respectively.
- Telepathy: Both communicate to the characters through this manner, but otherwise make various whirring noises.
- Weakened by the Light: Abolubas, which is how Tiga kills him.
- First Appearance: GUTS into Space Part 1
- Action Bomb: The Gobunyu Giga sets itself to self-destruct in an attempt to destroy Tiga and the GUTS base in one go.
- Combining Mecha: Thousands of Gobunyu Vaha can merge to form Gobunyu Giga.
- Humongous Mecha: As Gobunyu Giga.
- Meaningful Name: Named after Goibniu, the ancient Irish god of metalwork and patron of smiths.
- Mecha-Mooks: Of the mysterious space fortress that spawns them.
- Mechanical Lifeforms: Yazumi discovers this when he gets his hands on a piece of a Gobunyu, as the robots are not powered by anything, making their insides hollow.
- First Appearance: GUTS into Space Part 2
- Giant Space Flea from Nowhere: Appears completely unexpectedly without foreshadowing when GUTS attempts to escape the fortress, if only to fill the monster fight quota.
- Humongous Mecha: Formed directly from the substance of the space fortress itself.
- Meaningful Name: Ogma was a hero in Irish myth.
- Shock and Awe: Can fire lightning bolts from its hands.
- First Appearance: Deban's Turn
- Archenemy: Of Deban.
- Evil Laugh: His "roar".
- Hate Plague: Enomena emits electromagnetic waves that drive humans into violent insanity. To make matters worse, the waves also slowly destroy the human brain, eventually killing the victims unless Deban's calming waves save them.
- Jerkass: A bullying and violent being who revels in making people hurt each other.
- Our Demons Are Different: Although he's actually an alien, Enomena's design is heavily based off demons. His Boss Subtitles is simply Majin (Demon).
- Psychotic Smirk: Bears a permanent one on his face.
- Shock and Awe: Can electrify his claws in combat.
- First Appearance: Deban's Turn
- Aliens Among Us: Nobody notices though because the people he's living with wear their weird costumes wherever they go.
- Disney Death: After seemingly sacrificing the last of his power to save Ultraman Tiga from Enomena's mind-destroying waves. He gets to keep performing with the circus guys as well!
- What Measure Is a Non-Human?: The circus troupe he hung out with discovered Deban was a monster pretty early, but accepted him quickly and became good friends. When GUTS scientists ask if they can perform experiments on Deban's powers, the leader is outraged, and he initially refuses to let GUTS use Deban's powers against Enomena because it seems to him they're treating his friend as a weapon.
- First Appearance: A Fog is Coming
- Breath Weapon: Magnia breathes electrifying fog from the cluster of tentacles on its face.
- Expy: Of Okorin from Ultraman 80, another lumpy, extraterrestrial kaiju formed from a species of ball-like parasites.
- Mook Maker: The meteor Magnia is spawned from.
- Ominous Fog: The Magnia parasites produce a fog that cloaks their presence.
- Puppeteer Parasite: The parasites turn their victims into zombies to guide them towards the meteor as sacrifices
- Shout-Out: To Stephen King's The Mist. The book is even mentioned by a character in the episode (although not by name).
- Weaksauce Weakness: The parasites can be destroyed with water.
- Worm That Walks: Magnia's kaiju form is a merging of the parasites to defend the meteor.
Dinosauroids Adam and Eve
- First Appearance: Planet of the Dinosaurs
- Everything's Better with Dinosaurs: They're based off an old theory that the small but highly intelligent dinosaur Troodon could have eventually evolved into a human-like form.
- Red Oni, Blue Oni: The calmer and questioning Eve is the blue to the red Adam, who aggressively and loyally serves the Naga until he realizes he's been deceived.
- The Reptilians: Not actually, but they strongly resemble the part, complete with the ability to disguise themselves as humans.
- Unwitting Pawn: The Dinosauroids believe that the Naga will let them inherit the Earth in the aliens' second conquest. The truth is the Naga really couldn't care less for Adam and Eve, seeing them only as tools to control the Weaponizers.
- First Appearance: Planet of the DinosaursVoiced by: Mariko Takigawa
- A God I Am: The whole race believe themselves as gods, which isn't too far of a stretch considering their power over creating life.
- Hoist by His Own Petard: Tiga destroys their spaceship by hurling the Weaponizers' neutron bombs at their spaceship.
- Invisible Aliens: The Naga never appear physically, only their voices are heard and spaceship is seen.
- Sufficiently Advanced Alien: The Dinosauroids refer to them as being like gods and the Naga certainly view themselves as such.
- First Appearance: Planet of the Dinosaurs
- Action Bomb: The Naga outfitted them with neutron bombs for this. Worse still, they can merge their bombs together for an explosion capable of annihilating all life on Earth.
- Chest Blaster: They have machine guns built into their chests.
- Cyborg: Obviously.
- Everything's Better with Dinosaurs: Cyborg dinosaurs created by aliens!
- Tyrannosaurus rex: Close. They're based on Tarbosaurus, a very close relative of T-Rex from Asia.
- First Appearance: Go! Monster Expedition Team!
- Expy: Of Twin Tail from Return of Ultraman, in terms of design.
- Hollywood Acid: Litomalus can spew explosive acid from its midsection that dissolves steel and kills vegetation.
- Poisonous Person: Constantly secretes a toxic gas made from the vehicle exhaust it consumes that kills all plants in its surroundings.
- Spell My Name with an "S": Also called Litolumalus or Litmars.
- Walking Wasteland: Once again, its presence kills all vegetation around it due to its poisons.
- Whip It Good: Like Twin Tail, its primary weapons are the two whip tails on its top. Weirdly, it also uses them to pole vault during the fight.
- First Appearance: The Rainbow Realm of Monsters
- Achilles' Heel: Silvergon has extremely poor eyesight, only able to see moving objects. Tiga was able to take advantage of this once he found out by simply attacking Silvergon whenever it wasn't looking.
- Breakout Villain: Though he doesn't recur as often as Golza, Silvergon is one of three Tiga kaiju to appear in other series.
- Breath Weapon: Breathes blue fireballs in later incarnations.
- Dimension Lord: Of the Rainbow Underworld, which is entered through the arches of a rainbow. Killing Silvergon ceases the realm's existence for easy escape though.
- Dumb Muscle: Despite its ridiculous strength, Silvergon is easily fooled, and at one point in the fight, attempts to imitate Tiga by trying to perform a Zepellion Beam and transform into Power Mode.
- Everything's Better with Dinosaurs: Ram-horned, ridiculously strong dinosaurs with poor eyesight in this case.
- Everything's Better with Rainbows: Not in this case. The rainbow is actually a gateway to Silvergon's realm. Interestingly, the rainbow gate has the colours in reverse, with violet on the top and red on the bottom.
- Expy: Of Red King. The production team even liked to call it "Heisei Red King".
- The Juggernaut: The Zepellion Beam barely even fazed this guy!
- Super Strength: Even by kaiju standards. Silvergon is so strong that it can punch holes through a force field with its bare hands. Even Tiga in Power Mode had a tough time with him.
- First Appearance: I Saw Obiko!Voiced by: Shoichiro Akaboshi (also human form actor)
- Alas, Poor Villain: GUTS feels pretty bad for him when they realize Obiko wasn't evil, just unable to let go of the past because he was afraid of being forgotten by his ancestral home.
- Breath Weapon: He and his magic shadow can spit fire.
- Casting a Shadow: Obiko can only live in darkness, so he comes out at night to cause mischief. He also has a living mass of shadow accompanying him that assists in his scares.
- Living Shadow: His perpetual companion and partner-in-mischief.
- The Magic Goes Away: An unfortunate victim of the modernization of the human world pushing out the magical creatures that humanity once feared.
- Mercy Kill: When GUTS tells him that the primitive village of the olden days is gone for good, he lets Ultraman Tiga kill him.
- Non-Malicious Monster: Obiko is merely a mischievous monster who simply just misses the older days when the town he terrorized was just a quiet village without any streetlights.
- Shock and Awe: In human form, he carries a magical staff that shoots lightning.
- Teleport Spam: Can teleport between places of darkness, which he uses to frustrate GUTS when they're chasing him around town.
- Voluntary Shapeshifting: His preferred form is a noodle vendor, with his magical shadow hiding inside the cooking pot.
- Weakened by the Light: The reason why he enjoys the darkness so much and wishes that his home village would return to its pre-street lights days.
- Youkai: Not based on any real examples, but is definitely meant to be one.
- First Appearance: One Vanishing Moment
- Big Creepy-Crawlies: Vaguely resembles a stag beetle.
- Blade Below the Shoulder: Possesses blades for arms.
- Shock and Awe: Shoots lightning from its horns.
- First Appearance: A Memory of Blue Skies
- Archenemy: Of the unnamed aliens that possess Shinjoh and Maya.
- Curb-Stomp Battle: Natarn's battle with Tiga lasts less than a minute and he doesn't even land a single hit on the hero! However, the episode focuses more on the unseen aliens in the bodies of Maya and Shinjoh, so really Alien Natarn was only there to fill the weekly fight quota.
- Demonic Possession: Like the benevolent but never-seen aliens he's pursuing, Natarn possesses the human he encounters in order to sneak around on Earth.
- Vader Breath: His "roar".
- First Appearance: Monster Zoo
- Non-Malicious Monster: Unlike many kaiju, King Molerat is simply just an oversized animal — it doesn't want to destroy cities, only to do its own thing. It's for this reason that Rena opposes killing the creature and Tiga obliges to her pleas, turning the creature into a small and harmless form.
- Shock and Awe: Shoots lightning bolts from its ears.
- Weakened by the Light: Being a mutated mole, King Molerat can't abide sunlight and enters a drowsy state. However, moonlight sees it become an active predator.
- First Appearance: GUTS Base Under AttackVoiced by: Tomohisa Aso
- Belly Mouth: In kaiju form.
- Blob Monster: Its normal form is a pinkish blobby creature. It turns into the form above by consuming enough electricity.
- Energy Absorption: Consumes electricity in order to grow in strength and multiply.
- Lack of Empathy: Despite its intelligence, Bizaamo ultimately reveals itself as bereft of compassion, for it cares only about its need to multiply and evolve, which is why it destroyed its creators' homeworld as it developed and attacked Horii when he tried to befriend it. However, GUTS feels pity after Tiga kills it because of how such an intelligent being lacked compassion for others, preventing it from using its powers for good or enjoying life in general.
- Our Monsters Are Weird: The name sorta gives it away, but just look at that thing!
- Shock and Awe: The blob form has the ability to shoot lightning bolts, but the kaiju form can also create an electrical force field, shock opponents on contact, and spit lightning orbs from its Belly Mouth.
- Technopath: Bizaamo can take over technology in its blob form, which it uses to feed off the device's electricity. If it takes over a device with communication (like Horii's laptop), it can speak through them.
- First Appearance: Zelda Point Defense
- Ascended to a Higher Plane of Existence: After completing its purpose, it becomes a huge and beautiful phoenix-cockatiel hybrid made of light and soars off into space with Asami's ghost on its back, suggesting this trope is what happened.
- Body Horror: Most of Shiela's skin and flesh is seared off, giving it a vaguely skeletal appearance.
- Breath Weapon: Breathes an orange beam of explosive energy. It also breathes a Tractor Beam, which it uses to safely take the Zelda gas away.
- Expy: Of Hydra from the original Ultraman, another bird kaiju with a vengeful and tragic connection to a deceased child.
- Eye Scream: GUTS blows out its left eye at the beginning of the episode.
- Giant Flyer: Like all bird kaiju.
- Non-Malicious Monster: Shiela's goal was to help Dr. Nezu get rid of the Zelda gas, so it could never be used to hurt people again.
- Tragic Monster: And how! Shiela is just as haunted by the death of Asami as Dr. Nezu, so it seeks to destroy the Zelda gas to avenge the death of its owner.
- First Appearance: Vampire City
- Bat Out of Hell: A gigantic bat-like monster that creates vampires and is worshipped by them as a god.
- Blow You Away: Uses its wings to create huge gusts of wind. When Tiga attempts to intensify the light from his colour timer to destroy Kyuranos (like he did with Abolubas), Kyuranos uses it to blow shipping containers into his face and break Tiga's concentration.
- Casting a Shadow / Evil Is Not Well-Lit: Kyuranos can create darkness in order to appear in daytime, which it does to battle Tiga.
- Mind over Matter: Kyuranos uses telekinesis to send a dazed Ultraman Tiga tumbling about after draining a good deal of colour timer energy with its bite.
- Our Vampires Are Different: Both Kyuranos and the vampires it creates are harmed by sunlight. The vampires also possess superhuman strength and agility while Kyuranos hide in a pocket dimension disguised as a coffin during daytime.
- Red Eyes! Take Warning: Although GUTS blows them out at the end of the battle.
- First Appearance: To the Southern Limit
- Mook Maker: Spawns tiny versions of itself to attack humans.
- Organic Technology: Of Alien Deshimo. That blue thing in the center of its mass? That's its heart.
- Our Monsters Are Weird: Not surprising, given its design was inspired by Bullton from the original Ultraman. Just look at it!
- Spin Attack: Deshimonia can spin itself rapidly to create explosions around it.
- First Appearance: The Sleeping Beauty
- Astral Projection: The sleeping alien uses this ability to torment Rena before possessing her.
- Demonic Possession: Possesses Rena to carry out its plans for Earth and torment Daigo.
- The Grays: Meant to resemble them.
- The Man Behind the Man: Although they don't appear in the Deshimonia episode, the alien is the monster's creator. It even uses a small Deshimonia as a spaceship.
- Not Quite Dead: GUTS originally founds its corpse in 1968 after it attacked their old base. However, the alien had really just entered a conscious state of hibernation so it could plan in secret.
- First Appearance: The Sleeping Beauty
- Breath Weapon: Breathes a poisonous gas meant to transform the atmosphere into Alien Deshimo's liking,
- Cyborg: Although it looks totally robotic, GUTS manages to pick up a life signal from it.
- Our Dragons Are Different: Cyborg alien dragons!
- First Appearance: The Time-Transcending Smile
- Achilles' Heel: Despite Goldras' arsenal of dangerous abilities that gave even Tiga a tough time, all of them are concentrated in the monster's horns, so destroying its horns renders it totally powerless.
- Barrier Warrior: Able to project a golden force field to deflect attacks.
- Blinded by the Light: Goldras can produce blinding flashes of light from its horns.
- Breakout Villain: Not to the extent of Golza, although Goldra's often paired up with Silvergon in reappearances due to Theme Naming.
- Everything's Better with Dinosaurs: Time-warping dinosaurs!
- The Juggernaut: Goldras proved to be one of Ultraman Tiga's toughest opponents due to its powerful abilities and natural strength.
- Shock and Awe: Can shoot lightning from its horns. Its time storms also warp victims through time by hitting them with lightning bolts.
- Super Strength: Of all the monsters in this series, only Silvergon outmatches Goldras' sheer strength, as it was able to give even Tiga's Power Mode a challenge.
- Time Master: Goldras' time storms, dense clouds of magnetic energy that transport humans, animals, and objects through time. It's implied that the time storms are behind every mysterious disappearance in history, such as the ships and planes of the Bermuda Triangle.
- First Appearance: FlowerVoiced by: Hitomi Miwa ("daughter") and Chisako Hara ("mother")
- Energy Weapon: Their preferred weapons are quarterstaffs made of energy.
- Flower Motifs: Cherry Blossoms. The aliens show a particular fondness for them and attack Earth during their flowering period.
- Fusion Dance: The two aliens merge themselves into a giant for the battle with Ultraman Tiga.
- Kabuki Sounds: Their audio cue, as you can tell from their mask-like faces.
- Playing with Fire: The Manon can shoot fireballs from their hands.
- First Appearance: The Mirage of a Monster
- Blinded by the Light: Faldon can release a powerful wave of light from its back. While it can't hurt people, it was strong enough that the blinded GUTS almost crashed their planes into each other.
- Doppelgänger Spin: Faldon can create illusory duplicates of itself that, although unable to be harmed or harm others, can swap places with the original.
- Red Herring: Faldon's episode revolves around a unscrupulous GUTS leader using monster illusions to instill mass hysteria, so the monster's role is essentially to add to the confusion as GUTS assumes Faldon's illusions are just the work of GUTS, and not an actual creature.
- First Appearance: Dear Mr. Ultraman
- Achilles' Heel: Makio reveals at the last minute that its only weak spot is its throat, allowing Tiga to shoot his Zepellion Ray there and kill Galra instantly.
- The Juggernaut: Galra completely shrugged off every single attack from both GUTS and Ultraman Tiga. If it wasn't for the timely reveal of its weakness by Makio, they would have certainly lost.
- Playing with Fire: Can shoot a heat beam from its forehead.
- Prehistoric Monster: Yazumi describes it as being of the same stock as Golza and Melba.
- Spell My Name with an "S": Also translated as Garula.
- Tunnel King: Spends most of the episode burrowing about.
- First Appearance: Dream
- Breath Weapon: An energy beam.
- Expy: Of Hoe from Ultraman 80, another strange-looking and intangible kaiju created from the mind of a heartbroken person.
- Intangibility: Attacks simply pass through Bakugon's body as the monster is simply just a dream brought to life.
- Living Dream: It also vanishes the instant Ikuta wakes up. Thus, Daigo is only able to fight it as Ultraman Tiga by going to sleep and dreaming as well.
- Meaningful Name: Derived from Baku, the mythic Japanese chimera that feeds on dreams.
- Our Monsters Are Weird: Being a dream brought to life, Bakugon has a surreal design — its arms are the heads of a cat and a snake, its legs are composed of stone and animal body parts, and it has a mane of tentacles.
- First Appearance: A Friend from Space
- The Assimilator: Think Star Trek's Borg, but for Ultraman.
- Fusion Dance: The Illudo merge themselves into a giant to battle Ultraman Tiga and defend their brain tower.
- Hive Mind: They have no individual minds of their own. Instead, the Illudo mind is in an enormous tower that stores a massive brain.
- Red Eyes! Take Warning: Their only distinctive facial features.
- Spell My Name with an "S": Also called Irudo.
- The Virus: They reproduce by turning other intelligent beings into more of their kind by using clawed tentacles in their palms to grab humans. Their brain tower also possesses this ability.
- First Appearance: The Town Where the Girl DisappearedVoiced by: Yukina Kurisu (also human form actor)
- A God Am I: The reason why Karen wants to take over the world is because she wants to remake it in her image.
- A.I. Is a Crapshoot: Big time. However, it is implied at the end that she still had some genuine humanity in her.
- Contagious A.I.: Spreads her control into GUTS base, taking over their defense systems and fighter planes.
- Enemy Scan: Does this to Tiga during the battle, allowing her to overpower him in combat. Fortunately, Yazumi's pleas to her give her the moment's hesitation Tiga needed for victory.
- Eye Beams: In her human form.
- Humongous Mecha: As Faivas.
- Master Computer: Of the gaming and programming town it created.
- Master of Illusion: Can create extremely realistic holograms, creating Aliens Muzan and Raybeak, Daigo, a mountain, a jumbo jet, a city, and even virtual worlds.
- One-Winged Angel: Faivas, which she uses to attack the world and battle Ultraman Tiga.
- First Appearance: Land Shark
- Expy: Of Gubila, another fish-based kaiju with a drill nose.
- Knight of Cerebus: Its appearance also marks that of Keigo Masaki and Evil Tiga, kickstarting the ending story arc.
- Land Shark: The episode is Exactly What It Says on the Tin.
- Robotic Reveal: Turns out to be a digging robot. At the end of the episode, it is revealed that Keigo Masaki built it to tunnel out the tomb of Evil Tiga and Gardi.
- Shark Fin of Doom: For most of the episode, only its gigantic fin cutting through the earth and smashing everything in its path is visible.
- Spell My Name with an "S": Sometimes referred as Geoshark.
- This Is a Drill: How it tunnels through earth. It can also fire an energy beam from the drill.
- Threatening Shark: Though it's a lot more than just a land shark kaiju.
- Tunnel King: Thanks to the drill nose.
- First Appearance: The One who Inherits the Shadows
- Canine Companion: The Ultraman version of whoever Evil Tiga once was.
- Critical Annoyance: Has a Colour Timer.
- Gentle Giant: Gardi never tries to hurt Evil Tiga in its attempts to free him from Keigo.
- Pet Monstrosity: Think the Ultra equivalent of a dog, complete with a Colour Timer.
- Sealed Good in a Can: Was petrified alongside its master 30 million years ago.
- Spell My Name with an "S": Also translated as Guarde or Guardi.
- Undying Loyalty: It tries so hard to save Evil Tiga that its heartbreaking.
- First Appearance: Eternal Life
- Eldritch Abomination: As a servant of Gatanozoa, though it's not based on any Lovecraft creatures like Zoiger is.
- Foul Flower: It's an Eldritch Abomination plant kaiju that breathes a hypnotic pollen and produces flowers that do the same thing.
- Herald: Its purpose is to prepare the world for the awakening of Gatanozoa by putting humanity into a state of defenseless and chaos so the Matser of Darkness can destroy civilization without opposition.
- Knight of Cerebus: Even moreso than Geozark and Evil Tiga, as its appearance heralds the return of Gatanozoa.
- Lotus-Eater Machine: Produces pollen that addicts anybody who breathes it, placing them in a dream-like state and bliss and apathy. When not in the hypnosis, people become desperate for more pollen, viciously fighting each other over even a single flower.
- Shock and Awe: Its vines can deliver electric shocks to foes.
- Whip It Good: Uses its thorny vines as whips in combat.
- First Appearance: Let's Go to Kamakura!
- Breath Weapon: Breathes a beam of acid.
- Intangibility: Taraban can become intangible to phase through earth, though it can leave its eyestalks visible when needed. It's the reason why GUTS wasn't able to detect the monster despite Mr. Hoshino's constant sightings of giant eyestalks around the train station.
- Invisibility: Although only its eyes remain visible.
- Non-Malicious Monster: Turns out to be just a baby that had gotten stranded on Earth and mistook the Enoshima Railway's horn for the cries of its mother.
- First Appearance: Goodbye to DarknessVoiced by: Masaharu Sato
- Action Bomb: GUTS discovers that, due to its massive consumption of energy, Metamorga's body temperature is so high that killing it will cause it to explode with the power of a nuclear bomb.
- Energy Absorption: Like Evolu, Metamorga constantly feeds on electricity to sustain itself. However, its powers have further developed, allowing it to consume chemicals and even eat one of Tiga's beam attacks.
- Madness Mantra: Can only speak a single sentence — "Begone, despicable humans!"
- Maniac Monkeys: A squirrel monkey transformed into an electricity-eating giant.
- Roaring Rampage of Revenge: Sought to destroy the Stellar Development Center for turning it into a monster.
- Tragic Monster: Ultimately, Metamorga is angry at humans for using science the wrong way, as the experimentation with the alien cells that created Evolu saw nothing good come out of them.
- First Appearance: Fugitive from the Moon
- Breath Weapon: They breathe strands of webbing, which they use to imprison those they impersonate.
- Expy: The combined form's design is inspired by Pestar.
- Fusion Dance: For the episode's battle, the two surviving Menjura merge into a single fused form. They also gain a laser blaster in between them in the fused form, though Tiga is able to destroy it to split them up.
- Giggling Villain: The Menjuras' roar consists of shrieking laughter.
- Playing with Fire: The spikes on their chest can shoot fire.
- Shapeshifter: Many aliens in the Ultra Series can disguise themselves as humans, but the Menjura are unique for they are among the few that can transform into specific individuals (so long as they have seen the person), which they use to sow distrust amongst the GUTS base.
- Shock and Awe: Can deliver powerful electric shock by grabbing others.
- Spikes of Villainy: Both Menjuras have massive spikes growing from their chest.
- First Appearance: The Ultra Star
- Faux Affably Evil: At first he seems goofy and harmless, but once he awakens Yanakagi, he turns out to be every bit as evil as any other Ultra alien.
- Mythology Gag: His We Will Meet Again warning and the way he vanishes afterwards homage Alien Mephilas from the original Ultraman.
- No Celebrities Were Harmed: His mannerisms in human form and his name are inspired by Charlie Chaplin and his Little Tramp persona.
- Parasol of Pain: His weapon of choice is his magical umbrella.
- Time Machine: Carries a small one disguised as a suitcase.
- Villain: Exit, Stage Left!: Once Yanakagi dies, he leaves, warning Ultraman We Will Meet Again.
- First Appearance: The Ultra Star
- Bilingual Bonus: His name means "Ugly Face" in the Okinawan dialect.
- Energy Absorption: Was able to consume Tiga's Colour Timer energy.
- Everything's Better with Dinosaurs: His subtitle is Space Dinosaur (which was that of Ultraman's final foe, Zetton).
- Expy: Being in the series' 30th anniversary celebration episode, Yanakagi is inspired by Bemular, Ultraman's very first enemy.
- Mythology Gag: Like Bemular, he appears at Lake Ryugamori.
- Spell My Name with an "S": Also spelled Yanakargi.
- First Appearance: Take Me Higher!
- An Arm and a Leg: Ultraman Tiga manages to tear off one of the first Zoiger's wings, forcing it to crashland and battle him. And then the monster tears off its other wing to fight Tiga in melee.
- Breath Weapon: Spits bolts of energy.
- Eldritch Abomination: Like their master, their name is derived from an H.P. Lovecraft horror, in thise case the Lloigor, dragon-like creatures that served Lovecraft's Gatanothoa.
- Giant Flyer: As a dragon kaiju, and all that.
- Lightning Bruiser: A lot of the episode featuring the first Zoiger revolves around chasing it due to how hast it is, but the same creature proves very formidable in close combat, even throttling Tiga until his Colour Timer starts flashing!
- Mook Carryover: In The Final Odyssey, the Dark Giants gain control over them and send the swarms to attack GUTS.
- Our Dragons Are Different: The servants of Eldritch Abomination, in this case.
- Red Eyes! Take Warning: Its the first thing GUTS spots of them when they explore the ruins of Rl'yeh.
- Sealed Evil in a Can: Imprisoned in R'lyeh with their master for 30 million years.
- Spell My Name with an "S": Also called Zoigar or Zoyger.
- Zerg Rush: They employ this in The Final Odyssey.
- First Appearance: Master of Darkness
- Ancient Evil: First appeared 30 million years ago to destroy human civilization, and now he's gonna do it all over again.
- Big Bad: It is connected to nearly every major event in the series' timeline in some way.
- Casting a Shadow: Is able to create a shadowy mist capable of consuming the entire Earth in darkness.
- Combat Tentacles: Has a multitude of tentacles around its head that it uses to battle Tiga. The biggest ones have pincers.
- Dark Is Evil: Its title says it all. The darkness it creates can even harm people!
- Eldritch Abomination: The character is even derived from Ghatanothoa, Cthulhu's son in the Cthulhu Mythos. It even hails from R'lyeh!
- The Man Behind the Man: Is implied to have been responsible for awakening Golza and Melba at the start of the series to destroy the petrified form of Ultraman Tiga, as well as awakening the appearances of various other monsters like Galra and Silvergon.
- Red Eyes! Take Warning: On its upside-down head whenever it extends its tentacles and pincers out.
- Sealed Evil in a Can: Imprisoned in R'lyeh with the Zoigers and the Dark Giants as underneath R'lyeh is the ruins of the civilization Tiga protected.
- Spell My Name with an "S": Also known as Ghatanothoa or Gatanothor
- Taken for Granite: Did this to Tiga thirty million years ago and does it to him again in their first match.
- Weakened by the Light: The reason why it cloaks Earth in shadow is because of this.
- First Appearance: Ultraman Tiga Gaiden: Revival of the Ancient Giant
- Names to Run Away from Really Fast: Its name means Eight Headed Serpent of Darkness.
- Orochi: Named after the legendary dragon, but it only has one head.
- We Hardly Knew Ye: It only appears to establish Maharoba's character and to give her the Spark Lance she will lend to Tsubasa and Amui, as well as the sword Yaminagino-Tsurugi.
- First Appearance: Ultraman Tiga Gaiden: Revival of the Ancient Giant
- Breath Weapon: Daidara uses his magic to grant it the ability to breathe fire.
- Everything's Better with Dinosaurs: Resembles a quadrupedal T-Rex.
- Pet Monstrosity: Of Dogura, who uses it alongside his lackeys Daidara and Orochi to destroy Ultraman Tiga.
- First Appearance: Ultraman Tiga Gaiden: Revival of the Ancient Giant
- Blinded by the Light: Dogouf can unleash a blinding light from its eyes while charging up its Eye Beams.
- Eye Beams: Can fire bolts of white energy from its eyes, often in combination with its Blinded by the Light ability.
- Golem: Inspired by the mysterious alien-like figurines of ancient Japanese history known as Dogu.
- Played by: Mio Takagi
- Played by: Takashi Kora
- A God I Am: He describes himself as the next step in the evolution of the human race when merging with Evil Tiga, declaring that the rest of humanity must become his subjects.
- Back for the Finale: Keigo is enlisted to help revive Tiga when he is defeated by Gatanozoa, using the same technology he used to revive Evil Tiga.
- Corrupt Corporate Executive: Keigo's the head of a scientific corporation who seeks to dominate the world by becoming superhuman.
- Enemy Mine: Forms one with GUTS to stop Gatanozoa, not that GUTS trusts him, of course.
- Evil Counterpart: Both Keigo Masaki and Daigo Madoka (note the names) are descended from the Ultramen, but whereas Daigo was chosen by Ultraman Tiga to become his human host and uses his transformation into Ultraman Tiga to protect people, Keigo force-merges with the Ultraman he discovers and is only interested in its power so he can become the most powerful person on Earth.
- Genius Bruiser: Not only is Keigo super intelligent, but he's trained his body for so long and so well that he's become extremely strong for his appearance.
- Gone Horribly Wrong: His attempt to control Evil Tiga leads to the giant's Sanity Slippage and rampaging across the city.
- Insufferable Genius: Keigo knows he is a genius and likes to show it through his condescending opinion of Daigo and belief in his own superhuman potential.
- Knight of Cerebus: Keigo's appearance marks the beginning of the story arc that climaxes in the reawakening of Gatanozoa.
- Mad Scientist: Reduced to one in the 4Kids dub.
Nook and Terra
- Played by: Sado Minoru (Nook) and Rika Kanetsuna (Terra)
- Creepy Child: Terra can be rather unsettling at times. A good example is when she plainly states to GUTS that Gijera's appearance marks the end of the world's arrival.
- Cyborg: After 30 million years of life, the only human aspects of their body left are their brains.
- Knight of Cerebus: Like Evil Tiga, their appearance is part of the buildup to the events of the finale.
- Mortality Ensues: They die the moment Tiga kills Gijera.
- Older Than They Look: Due to their immortality, they're actually 30 million years old.
- The Stoic: Both of them.
- Ultraterrestrials: Left Earth during the prehistoric era and have returned to witness the arrival of Gijera.
- Who Wants to Live Forever?: They realize this at the end of the episode, as their immortality has prevented them from developing as humans.
Tsubasa MadokaDaigo's son from 21 years after the events of Ultraman Dyna and protagonist of the gaiden Revival of the Ancient Giant. He too is a member of GUTS, but one day, he ends up sucked into a wormhole and ending up five thousand years in the past, where he learns a little about the history of Ultraman Tiga and his family line.
AmuiA village boy who lives in what is known as the Jomon Period of Japanese history. He befriends Tsubasa when he ends up in the past and ends up discovering that his connections with Ultraman Tiga.
MaharobaA vagabond warrior girl from the Jomon Period who allies with Tsubasa and Amui. She bears a striking resemblance to Tsubasa's sister Hikari Madoka.
DoguraAn evil wizard from the Jomon Period who commands the monsters Dougouf and Jomonoid, as well as two human lackeys (a spellcaster named Daidara and a warrior named Orochi). He seeks to take over ancient Japan and prevent the resurrection of Ultraman Tiga.
- First Appearance: The One who Inherits the Shadows
- Fallen Hero: Evil Tiga is only evil because of its human host's selfishness and arrogance taking over the resurrected Ultra's body in the forced merging.
- Kick the Dog: Literally! Evil Tiga viciously beats up Gardi.
- Only Known by Their Nickname: Evil Tiga is simply a nickname given by GUTS to describe the Ultraman driven to madness by Keigo's selfishness. No source has ever revealed the fallen hero's true name.
- Sanity Slippage: Evil Tiga's corruption sees him become more and more brutal and feral in his combat style. Horii's words imply that not even Keigo Masaki (his host) was controlling his actions, meaning that said Ultraman was reduced to a rampaging monster.
- Voiced by: Masaru Matsuda (also human form actor)First Appearance: Ultraman Tiga: The Final Odyssey
- The Brute: Of the Dark Giants, with the arrogance to fit one.
- Evil Former Friend: He was Ultraman Tiga's best friend before Tiga defected from the Dark Giants. Darramb still isn't happy that their friendship has long ended.
- Gratuitous English: For some reason, he tends to spout a few random English phrases, with a fondness for calling Tiga "My Friend".
- Mighty Glacier: Super strong, but doesn't have much else going for him beyond that. Tiga gained his Power Type by defeating him.
- Playing with Fire: Can smash the ground with his hands to channel fiery eruptions as a Finishing Move.
- Red and Black and Evil All Over: The only one of the Dark Giants to be coloured that way.
- Sealed Evil in a Can: Imprisoned in stone for 30 million years and very much evil
- Super Strength: His primary ability is that he's absurdly strong, even for an Ultraman.
- Voiced by: Tenmei Basara (also human form actor)First Appearance: Ultraman Tiga: The Final Odyssey
- Ax-Crazy: He's completely psychotic in his mannerisms and behavior, taking great glee in the opportunity to kill Ultraman Tiga.
- Arm Cannon: Wields a crossbow-like weaponon his wrist that shoots bolts of energy.
- Blade Below the Shoulder: His Arm Cannon can also become one when necessary.
- Fragile Speedster: Hudra is extremely swift, but easily beaten. It is revealed that Tiga gained his Sky Type by defeating him.
- Sealed Evil in a Can: Along with Darramb and Camila.
- Spell My Name with an "S": Also called Hyudra.
- Voiced by: Miyoko Yoshimoto (also human form actor)First Appearance: Ultraman Tiga: The Final Odyssey
- Big Bad: Of The Final Odyssey.
- Not Good with Rejection: Doesn't take it well when Tiga left her back then to redeem for his actual love for Yuzare. Even less so when she finds out about Rena.
- One-Winged Angel: Whe she realizes that Ultraman Tiga/Daigo is now engaged with Rena, she calls upon Gatanozoa's residual darkness to transform herself into a gargantuan shadowy version of Gatanozoa called Demonozoa.
- Psychic Powers: Displayed them in human form.
- Sealed Evil in a Can: Was sealed in stone for 30 million years.
- Shock and Awe: Can shoot lightning from her hands in human form.
- Spell My Name with an "S": Also called Kamila or Camira.
- Whip It Good: Her weapon of choice is an energy whip that can also transform into a blade.
- Yandere: And how?