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.
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
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.
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 Although he has a withdrawn personality, he is knowledgeable on the internet and is good at gathering and analyzing information.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.
Mimi Tachikawa: 4th grader. She is a princess who consistently does her own thing, putting her own interests first. In their adventure in the unknown world, she immediately complains and tries to escape, causing extra trouble and commotion one after another. However, when she has to do something, she gets it done
Jou Kido: Sixth grader. He needs to study for his middle school exams, so is completely devoted to studying no matter where he may be. Because he is the oldest of the group, he constantly makes the effort to be the one bringing them all together.
Takeru Takaishi: 2nd grader. Yamato’s younger brother. Due to circumstances, he is living apart from his brother, but with the incident of the first episode, he begins to possess a strange intuition.
Hikari Yagami: 2nd grader. She normally acts and says things in a way that make it seem as if she’s existing in another world. In the incident of the first episode, she senses her brother Taichi’s fight while he is in the internet.