First Appearance: And so it begins...
Allies: Kari, Matt, Sora, Mimi, Izzy, Joe, T.K., Agumon, Gabumon, Biyomon, Palmon, Tentomon, Gomamon, Patamon, Jennai
Enemies: Devimon, Etemon, Myotismon, Puppetmon, Piedmon, Apocylamon
Tai is the leader of the group and often acts without thinking making himself rash and reckless. However, his caring heart help him learn from his mistakes and help him get his friends out of danger. He is best friends with Matt and Sora and is highly protective of his little sister Kari. He was also shown to be willing to risk his life to save Sora's when she was held prisoner by Datamon and therefore got his Crest of Courage to work properly to digivolve his Greymon into Metalgreymon and beat Etemon in The Earthquake of Metalgreymon! He is also the bravest of the group which got him the Crest of Courage in The Dark Network of Etemon.
Tai's first major episode was The Birth of Greymon when his Agumon digivolved into Greymon when he was in danger of Shellmon.
Tai had another major appearance in Subzero Ice Punch where he fights with Matt until Mojyamon attacks under the influence of one of Devimon's Black Gears.
Tai was also the first one to get a crest known as the Crest of Courage in The Dark Network of Etemon and in the next episode, The Arrival of SkullGreymon, he learned the hard way that Crests should be used wisely.
In The Earthquake of MetalGreymon, Tai finally got his crest to work properly just in time to save Sora from Datamon by digivolving Greymon into MetalGreymon and seemingly defeating Etemon.
In Home away from Home, Tai was seemingly back in Tokyo with his little sister, Kari until he learned that it was an illusion.
During The Eighth Child Revealed, Tai learns from Wizardmon and a reformed Gatomon that Kari is the eighth child that Myotismon is after.
In Prophecy, T.K. and Kari use their crests to get Angemon and Angewomon to enable Agumon and Gabumon to warp digivolve to WarGreymon and MetalGarurumon respectively to beat Venomyotismon.
In My Sister's Keeper, when Kari falls ill, Tai does everything in his power to remedy her!
His Digivice which Digivolves Koromon to Agumon and Agumon to Greymon.
The Crest of Courage which helps him digivolve Greymon to MetalGreymon and later to WarGreymon.