Taichi's original Japanese seiyuu is Toshiko Fujita.
For the most part, she is probably most well known as Taichi's seiyuu,
but she has also done parts in other series such as Outlaw Star (Hilda), Ginga Nagareboshi Gin (Cross), and Saint Seiya (Eris).
His US voice actor is Joshua Seth. He voices other Digimon characters as well, such as Wizardmon and Kunbiramon. He has also had a few
roles, such as Wolf's Rain (Hige), CardCaptor Sakura (Takashi Yamazaki) and Trigun (Young Millions Knives).