Originally, Takuya and Koji could not get along with each other. But as the series progresses, the two become close friends and trusted partners in battle.
Zoe is one of the first characters to care about Koji, even though he is initially rude to the others. She offers her help to him on many occasions throughout the series. Koji eventually comes to show concern for Zoe, protecting her from several dangers. For example, as the group travels through the tundra surrounding the Autumn Leaf Fair, Koji lends Zoe his jacket to help her stand the cold.
When Koji first meets Kouichi, he is unsure what to feel and is awkward when the subject of Kouichi comes up. But over time, Koji and Kouichi become very close, often protecting each other fiercely when in battle.
|Main characters:||Takuya Kanbara | Koji Minamoto | J.P. Shibayama | Tommy Himi | Zoe Orimoto | Koichi Kimura | Bokomon and Neemon|
|Other characters:||Ten Legendary Warriors | Celestial Digimon | Gotsumon | Sorcermon | Katsuharu, Teppei, Chiaki, Teruo, and Angemon | Other characters|
|Antagonists:||Grumblemon | Ranamon | Arbormon | Mercurymon | Cherubimon | Royal Knights (Dynasmon and Crusadermon) | Lucemon | Murmukusmon and Ornismon|
|Other media:||Island of Lost Digimon | Things That Want To Be Told | A Train Named Hope | Digimon BattleSpirit 2 | Legendary Skies | Force Three | Visual Dictionary | Music | Singles | Albums|
|Relationships:||Takuya Kanbara | Koji Minamoto | J.P. Shibayama | Tommy Himi | Zoe Orimoto | Koichi Kimura|
|See also:||Digimon | Digital World | DigiDestined | D-Tector | Spirits | Fractal Code | Holy Ring | Digi-Egg | List of episodes|