|Voice Actor||Yuuko Tachibana (U子橘)|
Teppei and Katsuharu were bullying Tomoki in the first episode. They are responsible for making Tomoki forcibly go to the Digital World. After that, they took another Trailmon and went to the Digital World after Tomoki. Together with Katsuharu, Chiaki and Tetsuo, Teppei decided to stay in the Digital World and explore it even after they weren't chosen to inherit any Legendary Spirit. Angemon was sent by Ofanimon to protect the group.
While the Chosen Children are fighting the Royal Knights, his group are saved by Tomoki and his friends from a Centalmon-army commanded by Saggitarimon. With Katsuharu, he tried to bully Tomoki some more, but Katsuharu wouldn't stand for it, having grown more self-reliant and confident with time. After being saved by an attack of an Centalmon by Tomoki, he ended up respecting more him. After Angemon's death, his 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.