Ultraman Gaia (ウルトラマンガイア Urutoraman Gaia) is the third Ultra-being of Tsuburaya Productions' First Heisei Wave, created by after the 15-year long hiatus of the Ultra Series. He is the successor of Ultraman Tiga and Ultraman Dyna in the first Heisei-wave of the Ultra Series revival. His first primary form was Version 1, and he is incapable of form-changing like the previous two Heisei Ultramen. Later, he gained both Version 2 and Supreme Version from Ultraman Agul's light.
Battle Against Root of Destruction Part 1
"Ultraman! The Earth is in danger! I need to be like you! I need your power! Please, give it to me!"
- ―Gamu Takayama to Ultraman Gaia, Seize the Light!
During some virtual reality experiments (performed with the secret purpose of discovering the will of the Earth,) science protege Gamu Takayama briefly encounters the mysterious glowing red giant, Ultraman Gaia, at the end of a tunnel of light.
When the Root of Destruction begins its first wave of attacks on Earth, XIG is too new to be effective. Time stops and he falls through another light tunnel, where he encounters Gaia again. Because Gamu is so passionately concerned with the fate of Earth and humanity, Gaia generously gives Gamu his light, and he is thus able to transform into the Ultraman when necessary. The first monster, C.O.V. (Cosmic Organism Vanguard), was destroyed. Subsequently, more Root of Destruction-generated monsters attack, and Earth monsters are also mysteriously roused, so Gaia is kept pretty busy. Gamu joins XIG as a technical adviser, and later creates the Esplender to store the light that is the essence of Gaia.
Gamu then meets the mysterious Hiroya Fujimiya, the dark, angsty youth who possesses the light of Ultraman Agul. Fujimiya was responsible for developing the CRISIS computer array and its dire predictions, whom after many recalculations, learned is that the only way to save the Earth from Root of Destruction is to eliminate humans from the equation. He quits the Alchemy Stars and goes off by himself, only accompanied by Professor Kyoko Inamori, to find the will of the Earth, only to discover Agul.
Agul and Gaia both fought against Root of Destruction and occasionally help each other out, although Agul makes it clear their alliances are based on his duty to the Earth and his own ambitions, not out of friendship or gratitude. Fujimiya grows more agitated and reckless, and has less and less regard for his fellow humans in his desperate mission to save the Earth. He pushes himself to the point of endangering his own health, and became feverish and irresponsible. When bullied in a bar, he declares that humans need to be purged from Earth.
Gaia and Agul have a major clash and both are badly injured. Incredible energy is released during the fight, which opens up a giant wormhole. An immense serpent named Zoruim partially emerges to invade Earth. It turns out that Zoruim was anticipating this clash, and was able to influence CRISIS's computations. Gamu explains to Fujimiya that Crisis was sabotaged all along, and its analysis is fundamentally flawed. Fujimiya realizes that everything he believes in is based on this flaw, and becomes dejected, losing faith in himself, and that "there is nothing left for him to protect". He gives the injured Gamu the light that is the essence of Agul so that he can use it to defeat Zoruim. Fujimiya walked away, seemingly killed by a blast from Zoruim.
To insure his sacrifice wasn't in vain, Gamu accepted Agul's light into his Esplender, and afterwards turned into a new and improved Ultraman Gaia: Gaia V2. The new form headed for Zoruim and used his Quantum Stream, but it did little than annoy him. Shortly after Gaia turned into Ultraman Gaia Supreme, he went inside Zoruim's mouth, and used the Photon Stream to blow the monster's skull to pieces. The worm zone closed just seconds after.
While getting used to his upgraded powers, Meemos (who was actually CRISIS) invaded XIG's computer and managed to destroy all vaccines shot at it. However, when Atsuko's and Georgie's video game controller seemingly saved the day, Crisis then traveled to Geo Base, where it invaded the storage containing the pieces of Apatee and Algyuros. After melding the pieces together, he morphed into Fake Ultraman Gaia. However, he misjudged that Ultraman Gaia's power never stops growing, so in the beam match, the imitation was quickly defeated and revealed its true face: Meemos, a combination of Apatee and Algyuros from the past. Gaia quickly engaged in combat, but was soon losing the due to Meemos' metal boomerangs. Meemos threw a fork at Gaia's neck that pinned him to the ground while his four active boomerangs lashed his hands and feet. But thanks to XIG's assault, Gaia was soon freed and transformed into Supreme Version. A short beating later, Gaia used the Photon Stream to blast Meemos' body out of existence.
Battle Against Root of Destruction Part 2
Later in the series, GUARD tries to be more proactive about defeating the monsters that are attacking the Earth. They try to destroy dormant monster Tigris by sending a bomb into the ground, a plan that backfires horribly. They create an artificial wormhole to destroy the home planet of monsters C.O.V. and Pazuzu, also with disastrous consequences.
The K.H.S.T. uses this opportunity to send C.O.V. and a Pazuzu through the wormhole, and they become more powerful as a result. What becomes evident to Gamu is that monsters like Tigris, Mizunoeno Dragon, Syazac, and Izac, are creatures of the Earth like humans are, and perhaps it is not so fair to eradicate them when their only instinct is to survive. As for creatures sent by the K.H.S.T., they are not inherently evil. When they are sent to Earth their first instinct is simply to survive in an alien environment. Thus, Gamu/Gaia questions his morals and human motives.
Agul eventually returns later, and he and Gaia set their differences aside to fight the common enemy. When Gamu's life is threatened by robotic monster Σ-Zuigul, Fujimiya pleads with the Earth itself to fight one more time and he is granted the power of Agul again, as Version 2. Version 2 appears to have greater power than Version 1, as he was able to withstand Σ-Zuigul's second attack with little difficulty. Gaia and Agul finally join forces to defeat Super C.O.V. and Super Pazuzu.
The final assault on Earth forces begins with the arrival of Blitz Blots, a black and white avian monster who has the ability to absorb and fire back Ultra energy weapons with the red object on his chest. He systematically destroys GUARD. bases, and roughs up Agul V2 in the process. Blitz-Blots destroys a base that resembles the original Science Patrol headquarters. Tigris II emerges to fight Blitz-Blots and XIG, GUARD, monster, and Gaia must fight side by side to defeat Blitz-Blots. Ironically, part of this motley alliance includes the GUARD commander who killed the original Tigris, as part of an anti-monster vendetta.
Later, the giant creature Mokian is sent to Earth. He is a living monopole, a monster with enough magnetic power to pull apart the Earth's crust and end civilization. It is revealed by the Death God that the Root of Destruction feels humans are a threat to the universe and must be eradicated. To destroy Mokian and save Gaia, Ishimuro of XIG sacrifices the Aerial Base by ramming it into the giant monster, although miraculously, no one dies in the process. In a last effort before the final plan, Shinigami comes to the Earth in the form of Zebub, an owl-like monster. When Agul tries to fight, he ends up getting his leg cut open with his spear. Gaia (after Gamu had revealed his identity to XIG) soon comes in to heal Agul and let him change back and after a brutal fight Zebub dies and with that the final attack began.
Final Battle Against Zogu
The Root of Destruction sets into motion its ultimate plan, sending one of its most powerful agents: Zogu, a giant, white angel. She kills the Kaiser Dobishis that the Ultramen are fighting, and replenishes Gaia and Agul's power, only to completely overpower the two and make their Life Gauges expire. The two Ultramen turn back into Gamu and Fujimiya, which is telecast by the two KCB cameramen, despite Reiko's protests to turn off the camera. The battle is broadcasted across the entire world. They survive, but can no longer transform into Gaia and Agul.
At this point, all of Earth's monsters start emerging again all around the world to protect Earth from the Dobishis and Kizer Dobishis.
Everyone is brought back and united to participate together in the final battle against Zogu. Gaia, Agul, XIG, the Earth monsters, the Alchemy Stars, the KCB TV crew, and even Gamu's parents show up to encourage him. Gamu hatches a final scheme, in which the Alchemy Stars network is used to assist the last of the XIG fighters (some are flying normal military planes that have been modified by the Alchemy Stars) to channel energy from the Earth monsters to give Gamu and Fujimiya the ability to transform back into Gaia and Agul.
Boosted with this huge supply of energy, Gaia and Agul wipe the Earth clean of the hordes of Dobishi. However, as Gaia finishes off the Dobishi, Zogu reappears. She strikes down Gaia and Agul, but they fiercely counterattack. After being briefly staggered by the counterattack, Zogu morphs from her angel form into a colossal demon-like monster.
Gaia and Agul then worked together as a team and they destroy Zogu with their strongest attack, formed by combining their energy beams. Zogu is vanquished and people come out into the open to cheers for their heroes.
Ultraman Tiga, Ultraman Dyna, & Ultraman Gaia: The Decisive Battle in Hyperspace
In a world where Ultraman was a TV show, a young boy named Tsutomu, is failing in school due to his addiction to Ultraman. One night, while watching an Ultraman Gaia episode, he gets teleported into a hyperspace where he sees a girl and behind her a scene of mass destruction. He later sees that same girl, named Lisa, in his class. Later on, he finds a mysterious glowing ball (also from the dream) that tells him it can make any wish come true. The one thing Tsutomu wants more than anything else is to meet Gamu Takayama, Ultraman Gaia's human counterpart. After his wish is granted, Gamu actually appears, but a bully takes the ball and makes the second wish; for a kaiju, Satanbizor, to fight Gamu. After Gamu transforms into Ultraman Gaia, he finds he is losing power quickly, but manages to defeat the kaiju regardless. Afterwards, reverting into Gamu, he is chased by kids through the neighborhood until he finally manages to elude them by hiding in a toy shop. Once inside though, Tsutomu and his friends find Gamu and Tsutomu explains to Gamu just how he was brought to their world. Tsutomu tries hiding Gamu in an abandoned hanger, and during this time, Gamu sees that Tsutomu has a present for Lisa, a book called "Gulliver's Travels", which was a favorite of Gamu's as a child. While scanning the ball for the answers, not only do the police find him, but Gamu suddenly finds himself back in his own world, and accidentally takes the book with him. He is soon able to recall the events and checks the data he scanned from the ball, and gets a vision telling him that Tsutomu's world will soon be destroyed.
Unfortunately, during the whole ordeal, Tsutomu loses the ball, and the bully finds the wishing ball and wishes for a giant kaiju to appear. This wish created the kaiju King of Mons who immediately started destroying their suburban Tokyo neighborhood. Gamu becomes determined to open a gateway between the two universes to stop the kaiju and save the world Tsutomu lives in. Gamu is soon able to find his way there with the aid of a new mecha, the Adventure, and transforms into Gaia to battle the giant kaiju. Soon, Gaia was in a deadly battle against the kaiju. With Gaia having the upper hand, King of Mons spawned two more kaiju; Bajiris and Scylla. Tsutomu, knowing that Gaia is in trouble, tries to wish for help only to be sent flying into the air by one of the kaiju's stray beams. Just as all seems lost he is rescued by Ultraman Tiga and Ultraman Dyna, who have come into the battle to help Gaia. The three Ultramen battled the kaiju. Tiga and Dyna destroy King of Mons' spawns. Gaia, now in Supreme Version, manages to obliterate King of Mons with a highly powerful laser blast and saves the day. Gaia then turns back into Gamu and reveals Lisa's secret to Tsutomu: She is the human-interface of the ball. Even though Lisa will disappear forever, she urges Tsutomu to wish for the ball to vanish forever, repairing all of the damage that had been caused by it to that world. Before returning to his world, Gamu returns Tsutomu's book to him and tells him "Thanks to this book, we were able to meet again."
Ultraman Gaia: Once Again Gaia
Having lost the ability to transform into Gaia and Agul after their battles against Zogu, Gamu and Fujimiya return to their normal lives. But then, the underwater civilization seeked humanity's help, and thus, they restored Gaia's light to Gamu, allowing him to become Gaia once again to battle the remnant of the Root of Destruction, Gakuzom. He was joined by Fujimiya, who had also regained his powers from the same source. After the battle, Gamu and Fujimiya parted ways as they continued their normal lives.
Great Decisive Battle! The Super 8 Ultra Brothers
- Main article: Ultraman Gaia (Superior Universe)
Ultraman Gaia appears as an alternate universe version of himself in this movie.
Prior to the Ultraman Ginga series, Ultraman Gaia participated in the Dark Spark War but this time he fought not only alongside with the Ultraman Agul but, with the other Ultras and their allies against the evil side. In the war, Ultraman faced Zetton while in their midst battle, Dark Lugiel appeared and turned every Ultra alongside their allies, monsters and aliens into Spark Dolls with Gamu still as his human host. Just as the war was about to end, an unknown warrior appeared and faced Dark Lugiel but like the others he was also turned into a Spark Doll but he was kept within his Spark Device and fell alongside the other Spark Dolls to Earth.
After Ginga defeated Lugiel, Gaia is presumed to have returned to his original form and returned home in the form of a ball of light along with Agul and the other Spark Dolls.
Ultraman Ginga S The Movie: Showdown! The 10 Ultra Warriors!
"Hikaru, Shou. This is your Earth, so you must protect it yourselves!"
- ―Ultraman Gaia
Gaia was among the Heisei Ultras imprisoned by Etelgar and Arena in the Evil Mirror. After being freed, he regroups with Ultraman Tiga and Ultraman Dyna, facing the chimeric monster Five King that manifested from the combined form of their traumas against past monsters (in Gaia's case, Gan Q and C.O.V.). Gaia turned into his Supreme Version while Tiga changed into Power Type and Dyna changed into Miracle Type. Eventually, the three managed to defeat the ferocious monster with their combined attacks of Tiga's Delacium Light Stream, Dyna's Revolium Wave Attack Type, and Gaia's Photon Stream.
Ultraman Orb THE ORIGIN SAGA
Ultraman Gaia appears in the second half of Ultraman Orb THE ORIGIN SAGA. He teams up with Ultraman Orb as he, alongside Ultraman Agul, Dyna, and Cosmos try to defeat Queen Bezelb, who tries to destroy all intelligence in the universe.
- Home world: Planet Earth (Guardians of the Earth Universe)
- Height: micro ~ 50 m
- Weight: 42,000 t
- Activity time: Undefined (Gaia's Life Gauge only begins to flash when damaged to a certain extent.)
- Gaia Head (ガイアヘッド Gaia Heddo): Referring to the gold markings on Gaia's head, they gather light energy or mana from the Earth to power him, they are also required for the Photon Stream and similar beams fired from the head.
- Gaia Eye (ガイアアイ Gaia Ai): His eyes can detect hidden enemies, even those that are invisible or hiding behind objects, can also see vast distances.
- Life Gauge (ライフゲージ Raifu Gēji): The proper term for Gaia's Color Timer, he has no set time limit to how long he can be active. Instead it serves to show how much energy he has left, his energy is used up both by attacking and receiving blows.
- Gaia Breaster (ガイアブレスター Gaia Buresutā): The gold (Later gold and black) bands around his Life Gauge, they are pieces of armor and sturdiest part of his body, being almost indestructible. Upon gaining V2, they gain a black lines in between them and in supreme version they spread to his shoulders.
- Gaia Body (ガイアボディー Gaia Bodī): The red Ultra's body can withstand low temperatures and survive in the vacuum of space. He is also resistant to laser beams and fire.
- Arms: Concentrates the energy for most of Gaia's ray attacks.
- Feet: Able to generate anti-gravitational energy for flight. When landing, the energy discharge causes small eruptions underneath Gaia's feet.
Gamu raises the Esplender to the sky or in front of him, it then activates and bathes Gamu in a beam of red light before Gamu transforms into Ultraman Gaia. After Gamu receives Agul's light, sometimes red and blue light appears around him. Gamu may also shout "Gaia!" while transforming.
- Flight Speed: Mach 20
- Running Speed: Mach 5
- Underwater Speed: Mach 2
- Ground Latent Speed: Mach 2
- Jumping Distance: 1,200 m
- Grip Strength: 50,000 t (equivalent to 50 kg, for a human)
- Photon Edge (フォトンエッジ Foton Ejji): Gaia can generate a large, pink whip-like beam from his crest using the Gaia Head bands on the back of his head. He clenches his fists, and bows his head before heaving backwards, generating the whip. He then thrusts his head forward, unleashing the attack. Can destroy monsters in one hit.
- Quantum Stream (クァンタムストリーム Kuantamu Sutorīmu): The standard "L" style beam, but with the left fist in the crook of the right arm. His secondary finisher move, it can destroy monsters in one blow but is weaker than the Photon Edge. This attack is often blocked or reflected by enemies. Gaia can also fire it in the standard L style if he chooses to, though it seems weaker.
- Gaia Slash (ガイアスラッシュ Gaia Surasshu): A red energy blast from Gaia's hand.
- Gaia Healing (ガイアヒーリング Gaia Hīringu): Gaia can charge his arms with a rainbow colored energy and create a beam with them that calms down monsters and makes them peaceful for a while. Used on Zonnel.
- Gaia Blizzard (ガイアブリザード Gaia Burizādo): A freezing light fired from both hands.
- Gaia Punch: An intense straight punch, often deployed in a flury attack.
- Gaia Kick: A basic combat technique, various kicking techniques, often comprising of a middle, high, flying and roundhouse kick.
- Gaia Knee Kick: A knee strike while Gaia is holding a monster.
- Revolve Succession Kick: A kick using both feet and centrifugul force from a back flip.
- Gaia Diving Kick: A flying kick from the air to the ground.
- Gaia Backdrop: Gaia grabs an enemy from behind, bending backwards, and slams them into the ground.
- Gaia Lifting: A skill to lift an opponent with both arms.
- Gaia Leg Whip: In a manner similar to the Monkey Flip, Gaia leans back while holding the enemy and uses his leg to throw them.
- Gaia Headlock: A headlock to hold the opponent in places, squeezing their neck.
- Astride Attack: Used against a pushing enemy, purpose is to stop the movement.
- Gaia Charge Tactics: Gaia spins like a drill towards the enemy.
- Arm Blocking: Gaia uses his arms to block incoming projectiles.
- Ultra Barrier (ウルトラバリヤー Urutora Bariyā): Gaia creates a massive barrier to protect himself, or to protect an entire city from an explosion in the upper atmosphere.
- Whole-Body Emission: When held by Rezaito, Gaia shined a bright white light from his entire body to free himself and counteract the monster's intense heat. It was later used again as V2.
- Holing Hoop (ホーリングフープ Hōringu Fūpu): An energy ball released from Gaia's hands. When it hits a wall, it creates a door to the other side of that wall. It will stay open until Gaia passes through.
- Quantum Flash (クァンタムフラッシュ Kuantamu Furasshu): Gaia releases a light from his palms that seems to have repulsive properties, at least to monsters. Used on Candea.
- Analysis Ball: Gaia can create an energy ball from his hands that can not only back enemies away, but also analyze any toxins they produce and convert them into that toxin's antithesis upon destruction.
- Gaia Teleportation: A teleportation ability.
- Shrink Ray: Gaia shrinks the enemy and encases it.
After receiving the the Agul Force from Fujimiya, Gaia achieved V2; his new default form. The red line on his chest changed to black, possibly in resemblance to Agul's body pattern. His techniques are further enhanced and as well as receiving the use of Agul V1's powers.
- Flight Speed: Mach 25
- Running Speed: Mach 6
- Underwater Speed: Mach 3.2
- Ground Latent Speed: Mach 3
- Jumping Distance: 1,800 m
- Grip Strength: 70,000 t
- Photon Edge (フォトンエッジ Foton Ejji): Gaia can use a stronger version of the Photon Edge.
- Quantum Stream (クァンタムストリーム Kuantamu Sutorīmu): A stronger version of the Quantum Stream, it is fired the same way but is still weaker than the Photon Edge and Crusher.
- Powered Up Quantum Stream: A stronger version of the Quantum Stream. Used in Ultraman Ginga S The Movie: Showdown! The 10 Ultra Warriors!.
- Gaia Slash (ガイアスラッシュ Gaia Surasshu): The same technique as before but now the power is two-fold, it is also now fired like a dart.
- Light Bullets: A continuous stream of light bullets fired from the hands.
- Gaia Blizzard (ガイアブリザード Gaia Burizādo): Gaia can emit a intense gales of blizzard, in order to freeze enemies.
- Photon Crusher (フォトンクラッシャー Foton Kurasshā): Gaia able to perform Agul's Photon Crusher.
- Liquidator (リキデイター Rikideitā): Gaia is able to perform Agul's Liquidator. On its first use, it is red instead of blue, though during his fight with Meemos, it is the normal blue color.
- Gaia Healing (ガイアヒーリング Gaia Hīringu ): Gaia can charge his arms with a rainbow colored energy and create a beam with them that calms down monsters and makes them peaceful for a while.
- Specium Ray: Gaia can fire a red-colored Specium Ray from his crossed arms. Only used in New Century Ultraman Legend.
- Gaia (V2) Punch: A glowing red hot right punch. Used on Gan Q2.
- Gaia (V2) Chop: A skill that can cut into the skin of the enemy using the forearm.
- Gaia (V2) Elbow: Multiple Elbow strikes to pinpoint the enemy's weak spot.
- Gaia (V2) Kick: A variety of kicks such as a roundhouse kick and hick kick. Used on Gan Q2 with a combination of the Quantum Flash.
- Gaia (V2) Whip: After lifting the enemy into the air, Gaia throws them into the ground with great force.
- Gaia (V2) Backdrop: Having raised the enemy by one of their limbs, Gaia drives them into the ground.
- Gaia (V2) Lifting: A skill where Gaia lifts the enemy over his head. It is possible to carry super-heavy opponents through the air effortlessly.
- Version Up (ヴァージョンアップ Vājon Appu): Gaia can change from Version 2 to Supreme Version.
- Agul Blade (アグルブレード Aguru Burēdo): Like Agul, Gaia can now create a blade from his hand made of energy.
- Barrier: By spinning the Agul Blade at high speeds, Gaia forms a makeshift barrier.
- Heal (ヒール Hīru): Gaia can heal wounds of another Ultramen or himself. Used in episode 48.
- Ultra Barrier (ウルトラバリヤー Urutora Bariyā): A red round prismatic barrier emitted with both hands.
- Capture Beam (キャプチャービーム Kyapuchā Bīmu): A beam used to rescue a girl held aloft by telekinesis.
- Hyperspace Penetration Ability: Upon transforming, Gaia was able to enter Queen Mezard's dimension and later leave.
- Photon Discharge (フォトン・ディスチャージ Foton Disuchāji): A full body emission of energy.
- Teleportation: Gaia is able to teleport, at least a short distance.
- Crossover Formation (クロスオーバーフォーメーション Kurosu Ōbā Fōmēshon): A momentarily power boost utilized along with other Heisei Ultras to destroy Eteglar's castle.
- Power Transfer: Gaia can donate his powers to the Ultra Fusion Brace along with other Heisei Ultras to allow Ultraman Ginga Victory to use his powers.
- Energy Flash: When entangled, Gaia can release energy flashes to break himself free.
- Touch And Shot (タッチアンドショット Tatchi Ando Shotto): Gaia and Agul unite their hands and fire the Gaia Slash and Agul Slash. The resulting attack is ten times more powerful than either of them alone.
- Stream Crusher (ストリーム・クラッシャー Sutorīmu Kurasshā): Gaia and Agul unleash their Quantum Stream and Agul Stream, respectively at their enemies. Used on a group of Kaiser Dobishi.
- Double Photon Burst (ダブルフォトンバースト Daburu Foton Bāsuto): Gaia and Agul unleash their Photon Edge and Photon Crusher, respectively. Both beams collide with each other, creating a powerful photon beam.
- Combination Ray: A combination Ray with Agul, Cosmos, Orb, and Dyna.
- Combination Barrier: A combination barrier with Agul, Cosmos, Orb, and Dyna.
Supreme Version (スプリーム・ヴァージョン Supurīmu Vājon) is the form Gaia assumes when he uses the power of Agul's Force to the maximum. Black and blue lines align his body resembling Agul, and his physique increases dramatically. Unlike V2, he can only stay in this form for a short duration, except in the last battle. In this form, Gaia's fighting style changes to focus more on grappling, being able to at times effortlessly pick up, throw and suplex opponents with extreme ease.
- Flight Speed: Mach 25
- Running Speed: Mach 7.5
- Underwater Speed: Mach 5
- Ground Latent Speed: Mach 6
- Jumping Distance: 2,500 m
- Grip Strength: 120,000 t
- Photon Stream (フォトンストリーム Foton Sutorīmu): After gathering energy, Gaia will go into a crouching position, place his hands in front of his chest, as if he was in prayer. He will then slide one hand vertically up and one hands vertically down. A powerful energy beam will be fired from the space in between the hands. This is a very powerful attack and the strongest of all Gaia's techniques.
- Photon Edge (フォトンエッジ Foton Ejji): Gaia can generate a version of this technique that is stronger than V2's.
- Quantum Stream (クァンタムストリーム Kuantamu Sutorīmu): A stronger version of Gaia's Quantum Stream.
- Shining Blade (シャイニングブレード Shainingu Burēdo): Gaia can charge his arms with rainbow energy and then release it from his chest to create a boomerang made of energy. Destroys monsters in one hit.
- Gaia Blizzard (ガイアブリザード Gaia Burizādo): Gaia can emit a intense gales of blizzard, in order to freeze enemies.
- Gaia Slash (ガイアスラッシュ Gaia Surasshu): The same technique used in V2, however it is now thrown like a shuriken and always aimed at weak points on the enemy.
- Gaia Healing (ガイアヒーリング Gaia Hīringu): Gaia can charge his arms with a rainbow colored energy and create a beam with them that calms down monsters and makes them peaceful for a while. Used on Tsuchikera.
- Supreme Punch: A variety of punch techniques, each one is strong enough to stun foes.
- Supreme Cross Counter: A cross conter punch using an energy covered arm. Used to defeat Bizorm.
- Supreme Kick (スプリームキック Supurīmu Kikku): Gaia able to charge his right foot with energy while doing a midair attack.
- Supreme Elbow: An elbow strike channeling all of Gaia's power. Mainly aimed at the opponent's head.
- Supreme Chop: A variety of chop techniques, any of them can pierce the most robust of skin.
- Supreme Whip (スプリームホイップ Supurīmu Hoippu): Lifts the enemy with Herculean Strength and throws them.
- Supreme Leg Whip: A throw using the opponent's foot, flings them in a manner similar to the Monkey Flip.
- Supreme Face Crusher: Grabs the opponent by the neck and ploughs them into the ground.
- Supreme Lifting (スプリームリフティング Supurīmu Rifutingu): Holds an enemy overhead and then throws them.
- Ultra Barrier (ウルトラバリヤー Urutora Bariyā): The same barrier used in V2. It is now even more powerful.
- Immense Strength: In this form, Gaia's brute strength is immense. He is able to stun most of his opponents with a punch and pick up and throw even some of the heaviest of enemies.
- Flying Attack Tactics (フライングアタック戦法 Furaingu Atakku Senpō): Gaia kicks the opponent in the manner of a monkey flip and Agul's body hits the opponent.
- Double Guard Tactics (ダブルガード戦法 Daburu Gādo Senpō): Gaia and Agul use their Ultra Barrier at the same time to prevent enemies’ attacks.
- Double Barrier (ダブルバリヤー Daburu Bariyā): Gaia and Agul use their barriers together to form a more powerful barrier.
- Double Swing (ダブルスイング Daburu Suingu): Gaia and Agul grab enemies' tail, swing them and then throw them.
- Double Attack (ダブルアタック Daburu Atakku): Gaia and Agul fly at high speeds, fast enough to burst through Zogu's neck.
- Double Kick: Gaia and Agul use their flying kick attacks at the same time.
- Double Photon Burst (ダブルフォトンバースト Daburu Foton Bāsuto): Gaia and Agul unleash their Photon Edge and Photon Crusher, respectively. Both beams collide with each other, creating a more powerful beam.
- Double Slash Buster (ダブルスラッシュバスター Daburu Surasshu Basutā): Gaia and Agul shoot their Gaia Slash and Agul Slash at their opponent at the same time.
- Photon Square (フォトンスクエア Foton Sukuea): Gaia and Agul unleash their Photon Stream and Photon Screw at the opponent.
- Burst Stream (バーストストリーム Bāsuto Sutorīmu): Gaia unleashes the Photon Stream while Agul fires the Agul Stream. The energy rays collide and produce a far more powerful attack.
- Stream Explosion (ストリーム・エクスプロージョン Sutorīmu Ekusupurōjon): Gaia and Agul unleash their Photon Stream and Agul Stream, respectively at different heights, creating an enormous beam that even defeated Zogu.
- Beam Barrage: Gaia and Agul fire all their beam attacks at the enemy, rapidly and successively.
- Designer: Hiroshi Maruyama
- Ultraman Gaia is the second Ultra to fight another Ultra, the first being Ultraman Tiga against Evil Tiga.
- Ultraman Gaia is the first Ultra to fire his beam with his horizontal arm behind his vertical one, instead of in front.
- Ultraman Gaia and Agul are perhaps the most unique of Ultras in the entire series. The two are not aliens to the Earth and instead of running on sunlight or having the three minute rule, they are powered by the Light Energies of the Earth and Sea (some call it Mana) and seem to be metaphysical in nature. Their lack of a time limit is not seen again until Nexus.
- Like Agul, Gaia's power is always increasing, meaning his attacks are always stronger than the last time he used them. Gaia's Version 2 is the result of the Agul force reforming after Fujimiya gave his power to Gamu, so it is possible that Gaia may have acquired an altogether different Version 2 had he not acquired Agul's power.
- Ultraman Gaia is the second Ultra shown fighting a monster before merging with his host or taking a human form, the first being Ultraman Great.
- Gaia's signature attack Photon Edge is the second signature attack not to be formed by hands, the first was Ultraman Leo's Leo Kick.
- In the movie New Century Ultraman Legend, Gaia's and Agul's grunts were reused from Ultraman Zearth's.
- Gaia's name comes from the Gaia hypothesis, named after the primordial Greek deity whose name means "Earth", it states the totality of the Earth constitutes a complex organism.
- Gaia is one of few Ultras that was rarely defeated. His only loss was to Zogu towards the end of the series.
- Gaia V2 is seen by many as an incomplete merger, due to Gamu being given Agul's light. Most others explain this away as Gaia only receiving the light and powers of Agul, but not his mind, which remained with Fujimiya.
- Gaia's Color Timer sound is a modified, higher pitched version of Tiga's.
- The change of color in his Gaia Breastar in V2 is due to designer Hiroshi Maruyama's wish for a black coloration in a titular Ultra Warrior. Said color is inspired by the black tea.
- His mouth is designed after the B Type suit of Ultraman.