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.

Yamato "Matt" Ishida
Because Matt is one of the few members of the team who genuinely respects Izzy's abilities, the two generally seem to get along. Furthermore, while Izzy tends to always look at things from a technological or scientific standpoint, Matt is one of the few people who helps him see outside the box.

Sora Takenouchi
Because of Sora's warm nature, Izzy finds it the easiest to be himself around her. While he tends to bury himself in his computer rather than socializing with most of the others, Sora is the one who least falls victim to this. She's even able to bring out his sense of humor from time to time.

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.

Joe Kido
While Izzy has a vast knowledge of technology, he looks to Joe for the life wisdom he has to offer. He also is one of the only people besides Kari, and T.K. who understands Joe's full value from the beginning, something Tai, Matt, Mimi, and Sora figure out later in the series.

Takeru "T.K." Takaishi
Izzy is one of the few members of the team who doesn't acknowledge T.K. as the little kid of the group, though he's never been the type to undermine anyone. He genuinely respects him as a member of the team, which only grows more in Digimon Adventure 02.

Kari Kamiya
Though Kari is young, Izzy acknowledges that she is quite strong and capable, something which he uses to try and soothe Tai when he is worried about her. He is also one of the first to believe that there is something special and significant about her in relation to the digiworld in Digimon Adventure 02.

Yolei Inoue
Yolei looks up to Izzy,as he was president of the old Computer club.

Cody Hida
Izzy has a lot of respect for Cody. His gentle personality and thirst for curiosity bring out a mentoring side of Izzy which is seldom seen.

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.