|Voice Actor||Nakayama Rieko (中山りえ子)|
A boy who felt that his old life was boring and that he was more free in the Digital World.
Tetsuo went to the Digital World and met Katsuharu, Teppei and Chiaki. After they weren't chosen to inherit any Legendary Spirit, they decided to stay in the Digital World and explore it, under guard of Angemon. After Angemon's death, the group are captured by Lord Knightmon, and taken to the village of Mamemon. There, after the destruction of the village, the Chosen Children convince them to return to the real world.