Ultraman Tiga

- Voiced by: Yuji Machi (series; stock grunts), Hiroshi Nagano (The Final Odyssey and Superior Ultraman 8 Brothers), You Murakami (Ultraman Ginga S)
- An Ice Person: Tiga gains ice-related powers whenever he switches into Sky Type. His arsenal includss creating a cold explosion that freezes kaijus instantly, or releasing an icy mist from above his opponent and encases the kaiju in ice.
- Breakout Character: Franchise wise, Tiga has become one to the Ultra Series being perhaps the most popular Ultraman of the franchise overall and leaving him to inspire many other Ultras in terms of design and power. His series even gets a "remake" of sorts in Ultraman Trigger: New Generation Tiga where he is often mentioned in passing and alluded to.
- 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 was revealed that Tiga used to be evil and lead 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.
- High-Altitude Battle: Sky Type is meant to be this for any opponents with actual flying capability.
- 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 and existed 30 million years ago, Amui (who is implied to be Daigo's ancestor), Daigo, and Daigo's son Tsubasa. All of them merely inherit Tiga's light and power, with the original having left Earth long ago
- Light Is Good: As a being of light. In fact, turning to the light marked his shift from being a power-hungry tyrant and leader of the Dark Giants to a heroic protector and leader of a group of heroic Ultras.
- 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/Indonesian, referencing his three different forms.
- Multiform Balance: The first Ultra Series hero with such an ability.
- Jack of All Stats: Multi Type (Omni Mode in the 4Kids dub), his default form.
- Mighty Glacier: Power Type (called Power Mode by 4Kids). He turns red and silver.
- Fragile Speedster: Sky Type (renamed Speed Mode by 4Kids), in which he becomes indigo and silver.
- Golden Super Mode: Glitter Tiga.
- Superpowered Evil Side: Tiga Dark, as in his original form as a villain. According to his former teammates, this form's full potential can be realized if Tiga returns to the dark side he was once in.
- Our Giants Are Bigger: While "Giant of Light" is a term frequently given to the Ultras, Tiga is unique in that he is an ancient denizen of Earth rather than an alien being, thus fitting more closely to the classic fantasy giant more than his space counterparts.
- Purple Is Powerful: One of the few Ultramen with purple as a major part of his colour scheme.
- Red and Black and Evil All Over: Averted. He's red and black yes, but Tiga Tornado is the result of stealing his former friend Darramb's strength while slowly returning to the light.
- Sealed Good in a Can: Daigo discovered him as one. Though it's less the original Tiga himself, and more of his residual power left behind as a statue for the next host.
- Shrink Ray: Tiga's Cell Change Beam, used in one episode to shrink King Molerat reducing the monster into a cuddly rabbit form.
Ultraman

The one and only!
Late in the series, as Daigo unintentionally enters a time machine that sends him to 1965, he ends up meeting Alien Charija, who intends to release a hibernating monster named Yanakagi, sealed in a lake by the original Ultraman. Predictably, Yanakagi ends up being released and immediately goes on a rampage, and at the peak of battle, Ultraman quickly makes a comeback to give Tiga some timely assistance. This Ultraman hails from the Land of Light like the original, but his connection to Tiga and the other Ancient Giants of Light is unknown.
- First Appearance: The Ultra Star
- Alternate Self: Unlike the original Ultraman, this one hails from the Neo Frontier Space World.
- Big Damn Heroes: Ultraman's return quickly turns the tide of battle around, firstly by knocking Yanakagi off its feet, and then restoring Tiga's energy before assisting Tiga in dealing a fatal blow on the monster.
- The Bus Came Back: While Ultraman had appeared in stage shows, music videos and Ultraman Story from 12 years ago, this was his first reappearance in a mainstream entry of the franchise in the Heisei era.
- Clap Your Hands If You Believe: The original Ultraman is summoned back to existence by Eiji Tsuburaya's willpower and belief that the original protector of humanity would make a return.
- Dynamic Entry: How Ultraman made his appearance - in a glowing red orb that whacks Yanakagi across the face, preventing the monster from draining Tiga's health.
- Mythology Gag: It's especially fitting that the episode featuring the original Ultraman's first return in over a decade would have him fighting Yanakagi, a monster based on Bemular. Not to mention Yanakagi's Boss Subtitle being "Space Dinosaur", which is shared with Ultraman's original final opponent, Zetton.
- The episode's credits pays tribute to Ultraman as well, using clips from the original 1966 show instead of from the episode itself.
- Passing the Torch: Ultraman extending a handshake to Ultraman Tiga, after they've defeated Yanakagi together, pretty much established Ultraman had entrusted the all-important task of defending humanity to Tiga.
Fallen Ultramen
Evil Tiga

- First Appearance: The One who Inherits the ShadowsVoiced by: Takashi Kora (grunts)
- Bad People Abuse Animals: His cold-blooded beatdown on Gardi is, if that wasn't obvious on what his alignment is.
- Breakout Villain: Evil Tiga seems to be one of the most popular of the Fallen Ultramen, and has made many appearances in other forms of media relating to the Ultra series. He eventually became one of the main protagonists of the Darkness Heels stage shows alongside other popular evil Ultras such as Camearra and is also set to appear in the manga adaptation, Darkness Heels -Lili-.
- Dark Is Evil: Is slowly growing into this trope when the colors of his beam attacks are dark purple.
- Evil Counterpart: Pun of his name aside, his attacks are almost mirror match to the original Tiga, making it as if the hero fighting against his evil twin.
- 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.
- Finishing Move: Evil Shot; a reverse counterpart of Tiga's Zepellion Ray (his charging process was in reverse).
- Light Is Not Good: At first glance, his body shines in glittering white hue and sheds off to reveal his white skin. Unfortunately, being driven insane from a forced combination makes him anything but good.
- Kick the Dog: Literally! Evil Tiga viciously beats up Gardi, a dog equivalent of an Ultra.
- Mysterious Past: Who he originally was and how he came to rest in his tomb with Gardi remains a mystery.
- 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 was controlling his actions, meaning that said Ultraman was reduced to a rampaging monster.
Darramb

- First Appearance: Ultraman Tiga: The Final OdysseyVoiced by: Masaru Matsuda (also human form actor)
- The Brute: Of the Dark Giants, with the arrogance to fit one.
- Cold Ham: He's rarely expressive, but his tone of speaking sounds dramatic in and on itself when he refers to Daigo/Tiga with "my friend".
- 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.
Hudra

- First Appearance: Ultraman Tiga: The Final OdysseyVoiced by: Tenmei Basara (also human form actor)
- Ax-Crazy: He's completely psychotic in his mannerisms and behavior, taking great glee in the opportunity to kill Ultraman Tiga.
- Arm Cannon: Wields the Drafork, a crossbow-like weapon on 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.
- High-Altitude Battle: Is extremely skilled in fighting on zero-gravity environments and aerial dogfight.
- Sealed Evil in a Can: Along with Darramb and Camila.
- Spell My Name with an S: Also called Hyudra.
Camearra


- First Appearance: Ultraman Tiga: The Final OdysseyVoiced by: Miyoko Yoshimoto (also human form actor)
- Alas, Poor Villain: Her death scene is rather poignant, with her quietly lamenting how she wanted the light too.
- Big Bad: Of Ultraman Tiga: The Final Odyssey as the leader of the Dark Giants.
- Breakout Character: Like Evil Tiga, she's a rather popular character in the fandom, and her popularity led to many returns in stage shows and eventually to become one of the main protagonists of the Darkness Heels projects (including stage shows and the manga adaptation, Darkness Heels -Lili-).
- Cold Ham: She is rather subdued and rarely raises her tone, until she sees Tiga saving Rena. But nevertheless, her presence is felt through her intense gravitas, even with playing mind games with Daigo.
- Knight of Cerebus: Her very presence alone is enough to make the plot of the movie go darker than during Gatanothor's rampage.
- 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 Gatanothor's residual darkness to transform herself into a gargantuan shadowy version of Gatanothor called Demonthor.
- 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, Camira or Camila.
- Whip It Good: Her weapon of choice is an energy whip that can also transform into a blade.
- Woman Scorned: Is not happy at all about the fact that Tiga found an new love.
- Yandere: And how?
The GUTS team
Daigo Madoka

- Portrayed by: Hiroshi Nagano, Wayne Grayson (4Kids dub)
The bold and goodhearted protagonist. Daigo was formerly a member of TPC's transportation branch, but got a job at GUTS after he rescued General Sawai, the head of TPC, from alien abductors. He can transform into Ultraman Tiga using the Spark Lens due to the fact that he is actually a descendant of the Giants of Light.
- Action Hero: Well, what you'd expect from the guy who's an officer that can turn into an ultraman.
- 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".
- The Hero: Well, he is the guy who turns into Ultraman Tiga, isn't he?
- Heroic Self-Deprecation: In " the one who inherits the darkness" when Keigo stole the sparklens, he laments that without it he is just a weak human.
- Long-Lost Relative: In Final Odyssey, it is shown that Yuzare and Tiga had a thing together. Therefore, Daigo and captain Iruma are this since the latter is Yuzare's decendants and Daigo is implied to be the decendants of Tiga.
- 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, an Alternate Self of the original Tiga or a living concept created by the light inside humanity.
- Transformation Trinket: The Spark Lens.
Rena Yanase

- Played by: Takami Yoshimoto, Erica Schroeder (4Kids dub)
Daigo's love interest, Rena is the best pilot on GUTS. She is quite proficient in combat, but is also very sweet and cares a lot for Daigo.
- A Day in the Limelight: "The Man who Fell to Earth", "SOS from the Deep Blue Sea", and "Monster Zoo".
- Anger Born of Worry: She acts like this towards Daigo after she found out of his secret identity as Tiga.
- Animal Lover: She's quite fond of dolphins, as she was a dolphin watcher before joining guts.
- 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.
- Everyone Can See It: Her feelings for Daigo, not that she tries to hide it.
- The Lancer: To Daigo.
- Official Couple: With Daigo in the post-series films.
- Ms. Fanservice: When she's in her pajamas or swimsuits.
- 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 Gatanothor the first time.
Captain Megumi Iruma

- Portrayed by: Mio Takaki, Megan Hollingshead (4Kids dub)
The captain of GUTS. Captain Iruma delivers orders from the safety of the base, but maintains an excellent relationship with her subordinates.
- A Day in the Limelight: "The Devil's Prophecy", "The Devil's Judgement" and "The Mirage Monster"
- Badass Armfold: Her default posture, befitting her symbol of authority as GUTS' captain.
- The Captain: Of GUTS. Notable for being the first female leader in the Ultra Series.
- Everyone Has Standards: In the episode "The Mirage Monster", she objects with the idea of spreading false information to the public in regards to the illusive Faldon so just that the TPC officer who ordered her to do so trying to pressure the people as far how they react to kaiju attacks. Luckily, said officer didn't get away scot free thanks to General Sawai demoting him when he got word of the incident.
- Missing Mom: Is one to her son. They manage to reconcile later.
- Shipper on Deck: In "Dear Mr Ultraman", where she puts Daigo in suspension and gave Reina a vacation at the same time. Showing that even she knows of their feelings for each other.
- 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.
Commander Seiichi Munakata

- Played by: Akitoshi Ohtaki
Iruma's second-in-command. Commander Munkata leads the team on the front lines with a level-headed attitude.
- 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.
Masami Horii

- Portrayed by: Yukio Masuda, Jimmy Zoppi (4Kids dub)
A pudgy but brilliant scientist who makes all sorts of inventions to help GUTS against monsters and aliens.
- 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.
- Happily Married: At the end of episode 47
- Kansai Regional Accent: Speaks with one.
- The Smart Guy: Shared with Yazumi.
Tetsuo Shinjoh

- Portrayed by: Shigeki Kagemaru, Andrew Paull (4Kids dub)
The toughest member of the GUTS team, Shinjoh is a daring pilot and marksman. He has a younger sister named Mayumi who works as a nurse for TPC.
- 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. He risks his life to save his sister in "The Closed Amusement Park".
- The Big Guy: Plays this role in the team.
- The Lancer: To Daigo. He shared this role with Rena.
Jun Yazumi

- Played by: Yoichi Furuya
The youngest member of GUTS, Yazumi is a computer genius and the team analyst, using a search engine he developed himself called Akashic Records. He is treated as a younger brother by the rest of the team, especially Rena.
- 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
- Alliterative Name: Soichiro Sawai.
- 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.
- A Day in the Limelight: "To the Southern Limit", shared with Yoshioka.
- The Kirk: To Yoshioka's Spock and Nahara's McCoy.
- Rank Scales with Asskicking: Both him and Director Yoshioka are badass enough in fending off the Desmonia horde in episode 34.
- 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 Gatanothor.
- 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
- A Day in the Limelight: "The Phantom Dash".
- Annoying Younger Sibling: Let's see, she runs and repeatedly hits Shinjoh's injured and bandaged leg, happily tormenting her own brother.
- Her Heart Will Go On: Lost her crush when Gazort II attacked his plane.
- The Medic: Of the GUTS team.
Dr. Naban Yao
- Played by: Ichiro Ogura
Professor Yuji Tango
- Played by: Yoichi Okamura
Golza / Fire Golza

- First Appearance: The One who Inherits the Light
Being the very first kaiju of the Heisei Ultra Series, Golza marked the beginning of a new era for the franchise. Thus Golza is one of the most popular monsters of the franchise and has frequently returned in later entries against other Ultra heroes. Starting with Ultra Galaxy Mega Monster Battle, he was officially added to the main Showa continuity.
- Ambiguously Related: Its Boss Subtitles contains the words "Super Ancient" and it has a porous structure in its neck, not unlike the Zoiger's own structures, and it makes a beeline for Tiga and his allies upon reawakening, all of which might indicate that it is a minion of Gatanothor.
- 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.
- Expy: Was designed as sort of a modern re-interpretation of Gomess.
- 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, it even proves durable enough to survive its first fight and return much stronger.
- 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.
- A Molten Date with Death: How Fire Golza is disposed off, which also prevents a volcanic eruption threatening to wipe out a village.
- Playing with Fire: As Fire Golza, its head laser is replaced with fireballs.
- Prehistoric Monster: Along with Melba, both monsters come from millions of years ago and reawakened in the present to wreck havok.
- 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 alongside Melba as Tiga's first foe.
- Starter Villain Stays: Goes into hiding underground after his defeat. Later on Golza returns having hibernated in the core of an active volcano for months, turning it into the nearly-unstoppable juggernaut of a monster called Fire Golza.
- 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, which he obtained from a volcano's power.
Melba

- First Appearance: The One who Inherits the Light
An aerial monster similar to Golza in its origins. Melba was reawakened on Easter Island in the present to assist Golza in locating and destroying the petrified Ultras, leading GUTS in a race against time to awaken the ancient Giants of Light.
- Ambiguously Related: Its Boss Subtitles contains the words "Super Ancient" and it has a porous structure in its chest, not unlike the Zoiger, and it makes a beeline for Tiga and his allies upon reawakening, all of which might indicate that it is a minion of Gatanothor.
- Corrupted Character Copy: The Litra to Golza's Gomess. Unlike Litra, however, the two are allies and equally aggressive in their attempts to destroy the Ultras' statues.
- Fragile Flyer: In comparison to Golza's Mighty Glacier, Melba flies circles around Tiga, landing a few lucky hits, until Tiga knocks it out of the sky — at which point it's disoriented and a sitting duck for Tiga's Ranbalt Light Bullet.
- Giant Flyer: It's a kaiju, and all that.
- Our Dragons Are Different: Its title is "Super Ancient Dragon" and it resembles a draconic creature with pterosaur features.
- Prehistoric Monster: Both Melba and Golza are creatures from ancient times.
- Sinister Scythe: It has huge sickle-like middle claws.
Gakuma

- First Appearance: Legend of the Stone
- Aim for the Horn: The second Gakuma's horns are chopped off by Tiga in battle.
- 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.
- Expy: Of Zambolar, in appearance anyway.
- Horn Attack: The second Gakuma, after hitting Tiga with it's stone blast causing the Ultra to petrify, then attempts to use it's horns to smash Tiga into pieces. But Tiga changes his form to Power Type and breaks out.
- 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.
Kyrieloid


- 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 Gatanothor, 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.
- Expy: Their goal of ruling over humanity, the constant comparisons to devils, and their role as an Evil Counterpart of sorts to the protagonist brings Alien Mefilas to mind.
- 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.
- Blade Below the Shoulder: Grows a pair in Power Type.
- Good Wings, Evil Wings: For Sky Type, it grows bat-like wings.
- 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.
Ligatron

- 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.
Sealizar

- First Appearance: The Day the Monster Came Out
- Breath Weapon: Breathes toxic gas.
- Expy: Of Seabozu, both in appearance, their undead status, and possibly their names.
- 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.
Gazort

- 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.
- Is It Something You Eat?: While trying to communicate with the Clitters, GUTS explains to Gazort that humans are its friends, unfortunately Gazort has already decided that humans are a viable food source.
- 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 "Gazote" 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.
Alien Regulan

- First Appearance: The Man who Fell to EarthVoiced by: Takeshi Kuwabara
- Beam-O-War: His enery blast against Tiga's Ranbalt Light Bomb. Tiga wins.
- 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.
- Never My Fault: Blames TPC over the deaths of his friends and family... when he himself is the one who refused to retreat after being issued five warnings. Keep in mind he was the one who attacked first, and TPC is merely retaliating in self-defense.
- 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.
Giranbo

- First Appearance: Halloween NightVoiced by: Kyoko Fujinami
- Child Eater: She abducts children, eats their dreams until they're Empty Shells, and then throws away the husk in her Graveyard of Dreams. She's done this in mass every Halloween that GUTS has on record. She finds adults unappetizing.
- Dream Eater: Consumes the dreams of children, turning them into emotionless zombies she discards like used up trash.
- Halloween Episode: 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!
- 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 husks.
- Leitmotif: A rather twisted, musical-box version of "Ten Little Indians".
- Me's a Crowd: Can create an army of clones.
- 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.
- Nothing Is Scarier: We never find out where Giranbo came from or what she is. The closest thing given is her Boss Subtitles "Different Dimension People".
- Spell My Name with an S: Also called Gilanbo.
- Teleport Spam: Another trick it tries on Tiga.
- Weird Moon: It battles Tiga on Halloween night, and the moon in the background is clearly warped by Giranbo's powers — a creepy glowing smile with red eyes is clearly seen on the surface.
- Wicked Witch: A monster witch from another dimension who invades our world every year on Halloween to mass abduct children, drain them of their dreams until they're Empty Shells, and then throws them away like trash in the Graveyard of Dreams.
- Would Hurt a Child: Exclusively feeds on children. She finds adult dreams unappetizing.
Makeena

- 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.
- Expy: Makeena is seemingly based on Kirara, both of them being non-violent guardian monsters who travels around the galaxy in sphere form, whose reason for landing on planet Earth is not to destroy earth's cities, but to escort an alien woman back to her home planet.
- 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.
Gagi

- First Appearance: The Closed Amusement Park
- Aim for the Horn: Ultraman Tiga managed to break the first Gagi's horn with a well-placed chop.
- Barrier Warrior: Creates an impassable wall of energy with its horn.
- Expy of Gudon in appearance.
- Ferris Wheel of Doom: Attempts to destroy the Ferris Wheel where Shinjoh's sister is riding in one of its carriages. Shinjoh and a little boy he befriended had to hijack a couple of go-karts to draw Gagi's attention away until Tiga arrives to deal with it.
- 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.
Evolu

- First Appearance: Requiem to DarknessPlayed by: Shun Yuzuhara (Ryosuke)
- Alas, Poor Villain: Horii and Ryosuke's girlfriend Sayaka feel bad for him 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.
- Expy: Of Jamila, another Tragic Monster who Was Once a Man.
- 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.
Leilons

- 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.
- I Shall Taunt You: Constantly trolls Ultraman Tiga during their penultimate fight, including slapping it's backside at the Ultra's dimension while cackling away. It's easily one of the funniest monsters in the show.
- Making a Splash: Can spray high pressure water from its mouth.
- Nuclear Mutant: 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.
Alien Raybeak

- 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.
- Expy: Alien kidnappers who intend to abduct humans using shrink rays? Sounds like Dada.
- 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.
Alien Muzan


- 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, which is connected to where his pelvis would be in its bipedal mode.
- 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.
Sakuna Oni

- First Appearance: The Demon's ReturnVoiced by: Moriya Endo
- Bilingual Bonus: Its name essentially means "One-Eyed Ogre".
- Breath Weapon: Two actually.
- Blow You Away: Its back face breathes powerful gusts of wind, capable of knocking even Ultraman Tiga off his feet.
- Playing with Fire: The front face shoots jets fire from its maw.
- Cyclops: Has one eye on both of its faces.
- Expy: A sword-wielding Oni defeated centuries ago before awakening in the present day, who can survive losing it's head, sounds a lot like Enmargo.
- 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: Kōzō 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.
- I'm Melting!: Abolubas' fate.
- Red Oni, Blue Oni: Abolubas is the blue while Redle is the red (duh). 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.
Gobunyu Vaha / Gobunyu Giga

- 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 Irish blacksmithing god 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.
Gobunyu Ogma

- First Appearance: GUTS into Space Part 2
- Diabolus ex Nihilo: 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 the Irish wisdom/eloquence god responsible for creating the Ogham alphabet as proof of his scholarly prowess and the wrestling champion of the Tuatha dé Dannan.
- Shock and Awe: Can fire lightning bolts from its hands.
Enomena

- First Appearance: Deban's Turn
- Archenemy: Of Deban.
- Evil Laugh: His "roar".
- Expy: The relationship between Enomena and Deban plays out a lot like Dogyuh and Bock, the former being a cruel, ruthless alien bully who delights in hunting down a harmless, younger member of their kin.
- 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.
- Hate Sink: Out of the 40+ opponents encountered by Tiga, Enomena has the distinction of being perhaps the only one without any redeeming qualities. He spends the entirety of his debut episode hunting down the helpless Deban, who didn't really pose a threat to Enomena anymore and only desires to live peacefully with its adoptive family, and whenever Enomena is met with resistance from GUTS, the cowardly alien will use its teleportation powers to flee. His strategy consists of hunting down Deban and then fleeing like a Dirty Coward whenever met with resistance. When Deban seemingly pulled a Heroic Sacrifice to stop Enomena's Hate Plague, the vile alien then proceeds to attack the city, smugly believing there's nothing capable of stopping him now, until Tiga arrives to deal with him. And sure enough, when its clear that Tiga is easily stronger than him and winning the battle, once again Enomena attempts to teleport away while gloating to himself, until Tiga interrupts his teleportation and finally destroy him. Because for all the alien is worth, in the end of the day Enomena is merely a bully, a spineless coward and an absolute slimeball and complete jerk.
- Jerkass: A bullying and violent being who revels in making people hurt each other.
- More Hateable Minor Villain: While Gatanothor is the series' main antagonist, it doesn't appears until the final episodes, even if it sent monsters to do its bidding so it doesn't gets portrayed as too much of a bastard for the audience to hate. Enomena is a completely different story, being an alien invader written to be as despicable as possible, planning to drive humanity to destroy and kill each other by using a Hate Plague and hunts down an innocent alien, Deban, purely because he can.
- 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.
- Would Hurt a Child: While Deban's age, being an alien, is somewhat debatable, however the little alien's mannerisms and behaviour is no different from a child. And Enomena has NO qualms attempting to hunt and kill it anyway.
Deban

- 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!
- Expy: To Bock, with Enomena being Dogyuh. See above.
- Not a Mask: The circus troupe finds out about Deban's true identity after requesting for Deban to remove its mask.
- 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.
Magnia

- 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 DinosaursPlayed by: Yoji Matsuda (Adam), Misato Okano (Eve)

- 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.
- 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.
Alien Naga
- First Appearance: Planet of the DinosaursVoiced by: Mariko Takigawa
- A God Am I: The whole race believe themselves as gods, which isn't too far of a stretch considering their power over creating life.
- The Faceless: They never show up onscreen.
- 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.
Weaponizers

- 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.
- T. Rexpy: Close. They're based on Tarbosaurus, a very close relative of T-Rex from Asia.
Litomalus

- First Appearance: Go! Monster Expedition Team!
- Acid Attack: Litomalus can spew explosive acid from its midsection that dissolves steel and kills vegetation.
- Expy: Of Twin Tail from Return of Ultraman, in terms of design. It also have Gudon's whips.
- 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.
Silvergon

- First Appearance: The Rainbow Realm of Monsters
Silvergon is one of the few kaiju from Ultraman Tiga that has appeared other entries of the Ultra Series, but usually as a more powerful version of itself called King Silvergon.
- 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 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!
- Living Motion Detector: As mentioned above, Silvergon can't see anything that stands skill, which Tiga takes advantage of (with some difficulty).
- 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.
Obikoboushi

- 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.
- Berserker Tears: He's heavily implied to be crying during his fight with Tiga, even wiping his eyes at one point. Upon close observation, one can also see sparks coming from below his eyes when he charges up his Breath Weapon, as if he's shedding tears of fire.
- 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.
- Expy: A harmless monster who likes to hide in the shadows who spends much of the episode hiding from humans sure sounds a lot like Alien Pegassa.
- Feed It a Bomb: GUTS defeats his shadow companion by shooting a signal flare into a portal hidden within a well connected to his shadow's pot, causing the pot to explode and revealing Obiko's location.
- 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.
- Manchild: Played for Drama and combined with Immortal Immaturity. Obiko is a mischievous but harmless Youkai who enjoys playing pranks on the locals so that they wouldn't forget him, which makes it even more heartbreaking when he reacts with childish glee when the modernised village turns its lights off as part of GUTS' plan, thinking the village of old had came back. Even his fight with Ultraman Tiga plays out more like him throwing a tantrum over the loss of his home, with the Ultra trying to calm him down.
- 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.
Jobarieh

- First Appearance: One Vanishing Moment
- Big Creepy-Crawlies: Vaguely resembles a stag beetle.
- Blade Below the Shoulder: Possesses blades for arms.
- Diabolus ex Nihilo: Very little explanation is given to Jobarieh's nature and origins as it just suddenly appears in the middle of a more important GUTS mission, leaving few men to deal with it.
- Shock and Awe: Shoots lightning from its horns.
Alien Natarn

- First Appearance: A Memory of Blue Skies
- Archenemy: Of the unnamed aliens that possess Shinjoh and Maya. His species were originally allies of theirs' but war broke out when Natarn's kind betrayed them.
- 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.
- Torso with a View: Tiga blasts a MASSIVE hole in its torso at the end of their brief battle.
- Vader Breath: His "roar".
King Molerat

- First Appearance: Monster Zoo
- Glowing Eyes of Doom: Its eyes are visibly glowing when it begins its rampage at the end of the episode.
- Hair-Raising Hare: His kaiju and domestic forms both resembles a rabbit.
- 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.
Bizaamo

- 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 for how such an intelligent being lacked compassion for others, preventing it from understanding how it could use its powers for good.
- 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.
Shiela

- 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. Near the end of the episode it also starts bleeding from the mouth, implying just living in this state is agony for it.
- 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.
Kyuranos

- 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: Kyuranos can create darkness in order to appear in daytime, which it does to battle Tiga.
- Expy: A giant bat monster based directly on Draculas from Return of Ultraman.
- 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.
Deshimonia

- 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.
Alien Deshimo

- 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 Greys: 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.
Guwam

- 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.
- Mechanical Monster: It's default form resembles a robotic dragon.
- Our Dragons Are Different: Cyborg alien dragons!
Goldras

- First Appearance: The Time-Transcending Smile
Like Silvergon, Goldras has appeared in few other Ultra Series, but as King Goldras instead, which lacks the time-controlling powers in favour of being even more powerful than the original one.
- 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.
- 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.
Alien Manon

- 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.
Faldon

- 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 Iruma dealing with an unscrupulous GUTS leader using monster illusions to instill mass hysteria, so the monster's role is essentially to add to the confusion as Iruma assumes Faldon's illusions are just the work of GUTS, and not an actual creature.
Galra

- 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.
- Ambiguously Related: It shares the "Super Ancient" description in its Boss Subtitles and porous body structure that Golza, Melba, Gijera and the Zoigers have, which suggests that it might be a minion of Gatanothor like the latter two, but like the former two, the relationship is never made clear.
- 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.
Bakugon

- 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.
Alien Iludo

- First Appearance: A Friend from SpaceVoiced by: Kazue Ikura and Hideo Ishikawa
- 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.
Karen E-90 / Faivas

- First Appearance: The Town Where the Girl DisappearedVoiced by: Yukina Kurisu (also human form actress)
- 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.
- In Their Own Image: The reason why Karen wants to take over the world is because she wants to remake it in her image.
- 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.
Geozark

- 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.
Gardi

- First Appearance: The One who Inherits the Shadows
The pet of the Ultra who would become Evil Tiga, petrified alongside its master. Gardi takes host in a little dog that had led Daigo to Evil Tiga's tomb and been killed in the struggle with Keigo Masaki so that it can rescue its master from his descent into madness.
- Canine Companion: The Ultraman version of whoever Evil Tiga once was.
- Critical Annoyance: Has a Colour Timer.
- Expy: To Ron, another kaiju-sized pet to an Ultra.
- Gentle Giant: Gardi never tries to hurt Evil Tiga in its attempts to free him from Keigo.
- Kill the Cutie: Subverted, Gardi gets killed by an energy blast from Evil Tiga at the end of the episode, but the real Tiga revives him later on, albeit as a puppy instead of a monster.
- 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.
Gijera

- First Appearance: Eternal Life
The herald of Gatanothor, blooming only when his arrival is near. It produces flowers that spray an addicting and hypnotic pollen into the air responsible for the downfall of the ancient civilization Tiga defended. Now Gijera has returned in the present to do use its bliss-inducing pollen on humanity once more.
- Alluring Flowers: It's a flower-like entity that produces an addicting pollen that puts humans in a state of hypnotic bliss and makes them fight each other over the pollen, oblivious to the upcoming apocalypse.
- Eldritch Abomination: As a servant of Gatanothor, though it's not based on any Lovecraft creatures like Zoiger is.
- Foul Flower: It's a plant-like 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 Gatanothor by putting humanity into a state of defenseless and chaos so the Master of Darkness can destroy civilization without opposition.
- Knight of Cerebus: Even moreso than Geozark and Evil Tiga, as its appearance heralds the return of Gatanothor.
- Lotus-Eater Machine: Produces pollen that addicts anybody who breathes it, placing them in a dream-like state of bliss and apathy. When not in the hypnosis, people become desperate for more pollen, viciously fighting each other over even a single flower. On the other hand, the same pollen can also create an Elixir of Life.
- Mass Hypnosis: Its pollen can brainwash a large chunk of the city's population, all at once.
- Shock and Awe: Its vines can deliver electric shocks to foes.
- Vine Tentacles: It's vines can be used for grappling and restraining opponents.
- Whip It Good: Uses its thorny vines as whips in combat.
Taraban

- First Appearance: Let's Go to Kamakura!
- Breath Weapon: Breathes a beam of acid.
- Expy: A baby monster seeking it's Daikaiju-sized mother... sounds like Angoras, but Recycled IN SPACE!
- Gigantic Adults, Tiny Babies: The baby Taraban is roughly larger than a train carriage but still a shrimp compared to Ultraman Tiga. The mother, on the other hand, is roughly ten times the Ultra's size.
- 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.
Metamorga

- 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.
Alien Menjura

- First Appearance: Fugitive from the Moon
- Breath Weapon: They breathe strands of webbing, which they use to imprison those they impersonate.
- Dual Boss: Two Menjuras serves as the episode's penultimate battle.
- 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.
Charija

- First Appearance: The Ultra StarVoiced by: Masanori Machida (also human form actor)
- 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.
Yanakagi

- First Appearance: The Ultra Star
- Bilingual Bonus: His name means "Ugly Face" in the Okinawan dialect.
- The monster also has kanji on its stomach that read "Tsuburaya", in honour of the Ultra Series' 30th anniversary.
- Energy Absorption: Was able to consume Tiga's Colour Timer energy.
- 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.
- The shape of his ears as well as the colourful pattern on his stomach bring to mind Gyango, whose suit was modified from Bemular's suit. Charija also refers to Yanakagi as "space's greatest ruffian", a nod to Gyango's episode being titled "The Ruffian from Outer Space".
- Spell My Name with an S: Also spelled Yanakargi.
Zoiger

- 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.
- Bilingual Bonus: "Shibito" means "dead person" in Japanese, indicating the Shibito-Zoigers' undead status.
- Breath Weapon: Spits bolts of energy.
- Clip Its Wings: Lose a wing thanks to the combined effots of GUTS and Ultraman Tiga.
- Dracolich: The Shibito-Zoiger are undead versions of the dragon-like Zoigers, making them this trope.
- Eldritch Abomination: Like their master, their name is derived from an H.P. Lovecraft horror, in this case the Lloigor, dragon-like creatures that served Lovecraft's Gatanothoa.
- Fragile Flyer: They're among the weakest enemies in the show, a few of them being destroyed by GUTS without Tiga's help.
- 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 the undead Shibito-Zoiger and send the swarms to attack GUTS.
- Our Dragons Are Different: The servants of an Eldritch Abomination with colourful moth-like wings, in this case. The Shibito-Zoiger add being undead to the mix.
- 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: The Shibito-Zoiger employ this in The Final Odyssey.
Gatanothor

- 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.
- The Antichrist: Gatanothor has a subtle parallel to the Antichrist of the bible. In the Cthulhu Mythos Ghatanothoa is the son of Cthulhu who is the leader of the old ones paralleling the Anti-christ being the son of Satan. In the Book of Revelation, the Anti-christ leads humanity into an apocalypse with Jesus resurrecting to fight back against him. Similar to Daigo reawakening Tiga when Gatanothor starts to awaken with Daigo himself having a very clear Jesus parallel.
- Big Bad: It is connected to nearly every major event in the series' timeline in some way and was foreshadowed from the very beginning.
- Casting a Shadow: Is able to create a shadowy mist capable of consuming the entire Earth in darkness.
- Civilization Destroyer: Destroyed the ancient human civilization from 30 million years ago. In modern day, he awakens to do the same to humanity.
- 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!
- Dystopia Justifies the Means: According to Yuzare, he desires nothing more than to plunge the world into darkness, despair, sorrow, fear, and desolation. He is more than capable of it.
- Eldritch Abomination: The character is even derived from Ghatanothoa, Cthulhu's son in the Cthulhu Mythos. It even hails from R'lyeh!
- God of Evil: His subtitle is literally "Evil God."
- Hope Crusher: Yuzare explicitly states he desires to spread despair. This shows in his fighting style with Tiga: despite having a One-Hit Kill, he let's Tiga exhaust himself just trying to hurt him before finishing him off, which also drives much of humanity to despair.
- 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.
- Meaningful Name: Gatanothor was responsible for petrifying Tiga into stone. In the Cthulhu Mythos, people who look at Ghatanothoa are turned to stone except for their brains, leading them to go insane from the immobility.
- Nigh-Invulnerable: Nothing Tiga throws at him so much as makes him flinch, and he actually let's Tiga exhaust himself just trying to hurt him. Even Glitter Tiga has to hit him with five consecutive finishers in a row to finally kill him.
- Precursor Killers: Wiped out the ancient human civilization thirty million years ago.
- Rasputinian Death: Requires five consecutive Finishing Moves from a Tiga empowered by the combined light of every child on Earth to finally kill him.
- 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 Gatanozoa.
- 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.
Kurayamino-Orochi

- 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.
Jomonoid

- First Appearance: Ultraman Tiga Gaiden: Revival of the Ancient Giant
- Breath Weapon: Daidara uses his magic to grant it the ability to breathe fire.
- Meaningful Name: Derived from the Jomon Period, which it originates from and much of the story is set in.
- Pet Monstrosity: Of Dogura, who uses it alongside his lackeys Daidara and Orochi to destroy Ultraman Tiga.
Dogouf

- 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
.
Other Humans
Yuzare
- Played by: Mio Takaki
- Mystical White Hair: Her long hair is silvery-white and reaches her waist.
- Uncanny Family Resemblance: She is implied to be the ancestor of Captain Iruma.
Keigo Masaki
- Played by: Takashi Kora
- A God Am I: 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 Gatanothor, 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 Gatanothor, 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.
- Evil Is Not a Toy: No pun intended, but this is his Fatal Flaw. His ambition and greed drove Evil Tiga to madness and lose control of the giant, and to hammer that one down; Ultra warriors are incorruptible beings of light that bond with a human with a courageous and selfless heart like Daigo, Masaki is everything what Daigo is not — ambitious and selfish who wish to attain power to make himself superior to humans.
- 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.
- Humans Are the Real Monsters: Compared to the past kaiju and evil aliens Daigo and Tiga have fought, his very existence proves that how mankind will go far to extreme lengths to achieve power unopposed; best shown when he touts the power of Evil Tiga as his own, and the trope made its point clear when Masaki's delusions of grandeur drove Evil Tiga into a mindless monster beyond his control.
- 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 Gatanothor.
Tsubasa Madoka
- Played by: Shogo Yamaguchi
- Ace Pilot: Has become this in GUTS.
- Because Destiny Says So: To answer the question, "Why does Tsubasa know he's capable of unlocking Ultraman Tiga's powers after seeing the Spark Lens?"
- Henshin Hero: Due to being descended from the same bloodline as Daigo, he too cans use the Spark Lens to become Tiga.
- Only the Chosen May Wield: Is chosen to be the wielder of Ultraman Tiga's powers, due to inheriting his father's bloodline.
Amui
- Played by: Makoto Kamijo

- A Child Shall Lead Them: By the end of the episode.
- Instant Expert: Takes over the Spark Lens after Tsubasa... and turns out to be even more adept at using Ultraman Tiga's powers, even capable of type-changing which Tsubasa is unable to execute as Tiga!
- Long-Lost Relative: He is implied to be the distant ancestor of Daigo and Tsubasa.
Maharoba
- Played by: Yuri Yamazaki
- Action Girl: A wandering swordswoman capable of slaying kaiju-sized dragons all by herself.
- BFS: Her standard weapon is the sword she recovered from Kurayamino-Orochi.
- Uncanny Family Resemblance: Her resemblance to Hikari Madoka is used to imply that she is Rena's ancestor.
Dogura
An evil wizard from the Jomon Period who commands the monsters Dogouf 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.
- Big Bad: Of Revival of the Ancient Giant.
- Evil Sorceror: He uses his magic to create and command powerful monsters, and hopes to one day rule ancient Japan with it.
- Meaningful Name: Like Dogouf, his name is derived from the enigmatic Dogu figuines of Japanese archaeology, which is emphasized in the Dogu-like mask he wears.