From Wikimon

Biographical Information

Name	Thoma H. Norstein
	Thomas H. Norstein
Kanji/Kana	トーマ・H・ノルシュタイン
Age	14
Digivice Color	Blue
Voice Actor	Nojima Hirofumi (野島 裕史)
	Crispin Freeman

Personality

Profile

A coolheaded child genius who has already graduated from university. His intelligence is highly valued, even within DATS. He executes his missions based on data and theories, so his personality frequently clashes with Masaru's, who relies more on emotions. His mother is Japanese and his father is a prominent Austrian aristocrat.

He made his full appearance in Digimon Savers - Episode 03 appearing at his mansion in Japan after a brief shower scene. When Peti Meramon begin emerging in the human world, after Masaru and Agumon attempt to battle them and later run off, Thoma shows up alongside Gaomon and uses a device on a group of men who witnessed the Digimon, erasing their memories of the attack. When he arrives at DATS HQ, Thoma arrives with a Peti Meramon's DigiTama, reporting it to Satsuma. After embarking a sudden rivalry with Masaru, they both enter a boxing ring, Masaru pitting faith in power versus Thoma's faith in strategy. At the end of the match they deliver powerful blows to each other. After defeating several Peti Meramon and Meramon, a fight erupts between him and Masaru again, however, Satsuma puts an end to this by making Thoma and Masaru teammates.

While being part of this new team, conflict between Thoma and Masaru breaks out again and becoming even more frustrated when Drimogemon escape back to the Digital World. Defying Satsuma's orders, he enters the Digital Dive to enter the Digital World to track down and defeat Drimogemon.

Being in the Digital World, Masaru and Agumon go after them. When they come upon Thoma and Gaomon in the underground nexus, he realizes Thoma's injured, he begins to assist him out. Working together, he and Masaru, along with Geo Greymon and Gaogamon are able to defeat Drimogemon, who evolved to Digmon at the time. Masaru and Thoma decide to work together and become friends then return to the human world.

In Digimon Savers - Episode 12, After travelling to America embarking on research with Dr. Stimon, he returns to DATS HQ hypothesizing that Digimon have been appearing in the real world through human emotions, particularly the seven deadly sins. He also presents information that the barrier between the Earth and the Digital World had rapidly disintegrated during the ten years since the Digital World Exploration.

In DS15 on the quest for finding Mercurymon, they encounter Metal Fantomon, who manipulates his, as well as Masaru and Yoshino's, minds feeding him nightmares from the past. It is revealed that his mother died as the result of being hit by a speeding truck. After pulling through, he manages to allow Gaomon to evolve to MachGaogamon. at defeat Metal Phantomon.

After the fall of El Doradimon at the hands of Kurata, Thoma was forced by his father to abandon DATS and side with Kurata by means of curing his sickly sister, Relena (It was later known that Relena had a bomb attached to her neck, leaving Thoma no choice but to side with Kurata). He turned against his team, and during a fight with Masaru, he accidentally caused him to unleash a dark DigiSoul forming Shine Greymon Ruin Mode in the process, having disastrous consequences. Thoma betrayed Kurata by destroying the device he was using to control Belphemon Sleep Mode with.

In DS42, He gets into a dispute his father and remembers how his grandmother hated him for not being born a "true" Norstein due to his Japanese lineage. While protecting the airplane where Relena and his father were, he fought up against Lord Knightmon and unlocked Mirage Gaogamon's Burst Mode, defeating him. After then proceeds to return to the Digital World to meet up with Masaru to go after Yggdrasil.

After the defeat of Yggdrasil, he says his farewells to Gaomon before he heads back to the Digital World. Five years later, he wins the Nobel Prize for Medicine at the age of 19, as the youngest person ever to receive it. It is assumed that he won this award for curing Relena, his sister, of her disease, which previously had no cure.