Fan:Koushiro "Izzy" Izumi

This article details the relationships between Koushiro "Izzy" Izumi and his fellow DigiDestined of Digimon Adventure/Digimon Adventure 02.

Taichi "Tai" Kamiya
Izzy looks up to Tai as a leader and values his opinion very much. The Digimon Adventure novels reveal that Izzy had joined the soccer club at school in order to fulfill a physical education requirement and had been invited to summer camp by Tai; thus, he is indebted to him. Izzy also notes that Tai treats everyone equally, without discrimination.

Mimi Tachikawa
Izzy finds it hard to come to terms with Mimi's stubbornness and unwillingness to listen to logical reason (although said lack of logical reason turns out helpful in the Black Gear incident). He eventually, however, comes to terms with her down-to-earthness.

The Digimon Adventure novels mention that Mimi was Izzy's classmate prior to the series.

Ken Ichijouji
After Ken abandons his Digimon Emperor persona, Ken and Izzy get along very well, due to their almost equal levels of intelligence, most notably in A Chance Encounter.