Digimon Season 1-5

Thomas H. Norstein

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Thomas is a 14-year-old boy genius who graduated from the Stockholm Royal University of Science at the age of 13. His abilities are considered élite, even within DATS. He bases his operations on data and theoretical principles, and as such his personality clashes with Marcus'. His mother is Japanese and his father is a prominent Austrian aristocrat named Franz Norstein. Franz and Thomas's mother met while she was an exchange student in Austria, and Thomas lived with his mother in Japan until she died. He was taken back to Austria. He also has a younger sister, Relena, who suffers from a strange disease. It is never shown who Relena's mother is, but she died of complications during childbirth. While Thomas does not particularly care for his cold father, he does love his sister very much and does whatever he can to protect her. Calm and shrewd, he is the exact opposite of Marcus and sees him as a rival. He has an elitist attitude but he gets emotional when thinking of his mother, who died years ago when he was young.

Thomas' loyal partner is 
Gaomon, who always addresses him as "sir" and gets angry easily when he thinks someone is not treating Thomas with the proper respect. It has still yet to be revealed how the two actually met. A great deal of Thomas' background comes in episode 15, when MetalPhantomon manipulates his mind, feeding Thomas nightmares from the past. We learn his mother died in a horrific accident in which she was killed by a speeding truck. However, the nightmare does not have the entire desired effect on Thomas, and he pulls through, allowing Gaomon to warp digivolve to MachGaogamon. In episode 28, he finally obtained the power to Digivolve his partner further, but his Data Link Digivice was not able to support the enhanced power of his DNA and shattered, with the same process happening to both Marcus' and Yoshi's digivice. In the following episode, he, alongside his friends managed to repair their iC's and turn them into Digivice Bursts, allowing Gaomon to evolve to MirageGaogamon.

After the destruction of 
Eldradimon, Thomas was forced by his father to abandon his friends and side with DATS' greatest enemy Akihiro Kurata, who claimed to have the means to cure Relena. He even had to fight his former comrades, to the anger of Marcus, who accidentally invoked a dark DNA to fight him, with disastrous consequences. In the end Thomas betrayed Kurata by destroying the device he was using to control Belphemon, and rejoined with his friends to confront him. In episode 36 he also confronted his father that the only reason he went to study abroad was for him to become a physician, in order to find the cure for Relena's illness when any other doctor had failed before.

In episode 42, Thomas gets into an argument with his father and remembers how his grandmother hated him for not being born a "true" Norstein, being half-Japanese, an illegitimate child, and having a mother who wasn't an elite member of society. While protecting the airplane where Relena was located, Thomas fought against 
LoadKnightmon and unlocked MirageGaogamon's Burst Mode. After that, he rejoined the others and went to find Marcus back in the Digital World, partaking in all of the events leading up to the final battle. After the defeat of King Drasil, Thomas was forced to realize that the Digimon needed to go back to their own world, and spent one final evening with Gaomon. The next day, he and the others bid the Digimon farewell as they returned home, only to find out that Marcus had tagged along with them as well. Five Years Later, Thomas receives the Nobel Prize in Medicine at Stockholm City Hall, aged 19, becoming the youngest person ever to win it, for finding a cure for Relena's illness. 
Thomas is a very skilled fighter, and uses boxing to defeat his enemies. He is an Olympic boxing champion, and gave Marcus a humiliating defeat near the start of the season. Both smart and fast, he was capable of hanging with the Featherweight boxing worldchamp in a sparringmatch. His most impressive feat is to knock Marcus down with just two punches, even though Marcus has taken much harder hits and fought gangs alone. He is generally one of the better human-combatants in the series.

Thomas's Digivive First Blue & White, Then Black & Blue (Burst Mode)

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Thomas's Digisoul

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Gaomon Digivolution

Gaomon - Rookie Level

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Gammon is a young blue Akita Inu digimon who wears a red headband and a pair of large red boxing gloves. Behind the bandana he has a star on his forehead. Gaomon first appears in episode three of Digimon Data Squad. He and his partner Thomas had arrived in Japan as a bunch of DemiMeramon were being found in the country. Gaomon is very calm and quiet, his only dialogue consisted of answering "Yes master!" or "Sir yes Sir" to Thomas's orders. He was given more dialogue in later episodes.Attacks:
Double Backhand: Spins around very fast in a whirlwind, either creating a vortex or striking an enemy in a tornado of punches.
Rolling Upper: Jumps into the air, spinning and striking his opponent with his fist similar to Ryu's Shoryuken.
Speed Bash: Rapidly punches an enemy.

Gaogamon - Champion Level

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Gaogamon is Gaomon's Champion form. He resembles a large blue akita inu. Gaomon first Digivolved to Gaogamon in order to fight a pack of DemiMeramon. From then on, he appears in battle often. He started off being rivals with GeoGreymon, the Champion form of Marcus Damon's Digimon partner. This rivalry caused them to let an enemy Drimogemon escape. The two later settled their differences in the fifth episode of the season, and was able to finish off Drimogemon, who at that point had digivolved into Digmon together.
Attacks:

Spiral Blow: Gaogamon shoots a tornado from his mouth.
Dash Double Claw: Gaogamon slashes his enemies with his claws in an "X" pattern.
Gaoga Hound: Grips the opponent with a bite.

MachGaogamon - Ultimate Level

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MachGaogamon is Gaomon's Ultimate form. He appears to be based on WereGarurumon. Gaomon first achieves this form in episode 15, "The Gorge of Deception!". In this episode, Thomas was one of the humans who had been captured by MetalPhantomon. MetalPhantomon put them under a nightmare spell - causing Thomas to relive the day of his moms death. However, Thomas was able to break free of the spell, which awakened his DNA and allowed his partner Gaomon to Warp Digivolve into his ultimate form. In this new form, MachGaogamon was able to defeat MetalPhantomon.
Attacks:

Howling Cannon: MachGaogamon releases a sonic roar from his mouth.
Winning Knuckle: Flies at high speed and releases a powerful punch.
Gaoga Tornade: MachGaogamon flies in a spiral pattern around the enemy, creating a tornado around their body as he strikes rapidly from all angles.

MirageGaogamon - Mega Level

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MirageGaogamon is Gaomon's mega form. MirageGaogamon is covered in Chrome Digizoid armor and has the Digital Hazard sign on his chest. The same four triangles are on Guilmon chest. MirageGaogamon first appears during the fight with Kurata's group of humans-turned-Digimon, when Thomas' DNA super-powers MachGaogamon. In this episode, a silhouette of MirageGaogamon appears around MachGaogamon and produces a powerful energy attack. MirageGaogamon is properly introduced in the next episode, along with ShineGreymon and Rosemon, after the Data Squad learn how to harness this new power. MirageGaogamon faces off with Nanami, one of the Bio Tamers. MirageGaogamon is able to defeat Nanami's digimon form BioLotusmon when Thomas's plan allows him to get BioLotusmon at pointblank range.
Attacks:

Full Moon Blaster: MirageGaogamon accumulates all the energy in his body into his chest and fires a blast from the opening there.
Double Crescent Mirage: MirageGaogamon fires crescent moon shockwaves from his two hands.
Gale Claw: MirageGaogomon lunges forward with an incredible amount of speed, focusing his power into a single claw-swipe.

MirageGaogamon - Mega Level (Burst Mode)

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MirageGaogamon Burst Mode is MirageGaogamon's Mode change. MirageGaogamon temporarily assumes this form through Burst Digivolution - which pushes his powers and abilities to the limit. He loses the "Gale Claws", now wearing regular gauntlets, so that he can use his "Meteor Shackle" a mace-like flail with a crescent shaped blade, surrounded by an aura of planetary class energy. MirageGaogamon Burst Mode first appears when a Knightmon lead by LordKnightmon attacks Relena. Thomas' DNA allows MirageGaogamon to go into his Burst Mode, giving him the power to destroy LoadKnightmon. He appeared later on helping ShineGreymon Burst Mode alongside the other DATS Digimon to defeat the Royal Knight Craniummon. He last appeared in the final confrontation against King Drasil alongside the other DATS members.
Attacks:

Meteor Shackle: MirageGaogamon Burst Mode strikes his enemy with his spiked mace shackle that has the energy of a meteor strike.
Final Mirage Burst: An attack where MirageGaogamon Burst Mode puts all of his power inside his gauntlets crystals and releases it.
Luna Haken Slasher: Cuts and tears apart the enemy with the crescent blade on his shackle.