Izzy is the brains of the group. Because of his curious nature and his computer smarts Izzy was quickly able to learn about the new world they were in; this got him the crest of knowledge. Izzy however is very quiet and tends to get lost in his thoughts. He's one the group's most important members and when things turn complicated everyone turns to him. Izzy is an orphan and feels like a burden to his adoptive family, but he learns to open himself, love and be loved.

Izzy's digimon partner is Tentomon. Tentomon seems to be very knowledgeable of the digital world; but many times his information doesn't seem to be reliable. Tentomon admires Izzy's need to find the cause of everything; but he also tries to help him open up towards everyone else. Tentomon's evolution stages are Kabuterimon and Mega Kabuterimon.