Taichi Yagami: 5th grader. He is an 11-year-old with a fierce sense of responsibility who would rather act for someone else rather than for himself. When he's suddenly pulled into the internet to battle, he is able to correctly decide on what he needs to do, turning a pinch into opportunity.
Agumon: Taichi's Digimon partner. He appears to know Taichi from long ago. When their hearts combine, he evolves into Greymon to release a powerful fireball. He seems to have fulfilled a major role in a great war that took place in the old internet, but...?
Yamato Ishida: 5th grader. He dove into the internet way before Taichi, and has been investigating the unknown world. He's easily misunderstood because he's a boy of few words who is always "act first, explain later," but everything he does is to protect his friends. He opposes Taichi at times, but when it comes down to it, they both trust and depend on each other.
Gabumon: Yamato's Digimon partner. He understands Yamato's feelings better than anyone. When he evolves, he becomes the warrior Garurumon who excels in speed.
Sora Takenouchi: 5th grader. Taichi's childhood friend. In class, she's the "big sister" that the other girls depend on. Even when she jumps into the internet, she understands the situation and immediately works with Taichi.
Piyomon: Sora's Digimon partner. She is like a baby who follows Sora wherever she goes. She evolves into Birdramon, who specializes in aerial battle.
Koushiro Izumi: 4th grader. He lives in the same apartment complex as Taichi. Although he has a withdrawn personality, he is knowledgeable on the internet and is good at gathering and analyzing information. An incident involving the city's loop line is what causes him and Taichi to become friends, and they both jump into the adventure together.
Tentomon: Koushiro's Digimon partner. The moodmaker who speaks in a strange Kansai dialect. When he evolves into Kabuterimon, his exoskeleton strengthens giving him superior defense.
