Izzy Izumi (泉 光子郎 Izumi Kōshirō?) is a character in the anime and manga series Digimon Adventure and Digimon Adventure 02. He is partnered with Tentomon. Izzy is a computer expert and spends a large fraction of his time trying to figure stuff out on his "PiBook" laptop. Izzy lives with his adopted parents. When he initially found out that he was adopted, he began to subconsciously distant himself from his parents and focusing on his computer. The issue is resolved when his parents come forward with the truth and he accepts them as his true parents.
In the English dub, Izzy often says "Prodigious!"
He is the bearer of the Crest of Knowledge. He is one of the core members of the DigiDestined in both seasons. He is voiced by Mona Marshall in the English version, Umi Tenjin in the Japanese version and Rodrigo Antas in Brazil.
Three years later, Izzy is now in high school and was a president of the Computer Club. Izzy continues to play his technical role; he monitors the Digital World and alerts the new DigiDestined to upcoming troubles and problems. Izzy devises the plan to invade Ken’s base; with Cody’s information that a pipeline will cross paths with Ken’s base, he directs Agumon and Gabumon to create a diversion. Later, when Ken’s base is about to explode, Izzy tells them the problem and when the warp is back to normal. With Willis from America, he also figures out that the new Digivices have three new functions, and dubs them the D-3s. Lastly, after school gets out, Izzy theorizes that the power of the D-3 is what really opens the gate to the Digital World. This theory proves to be correct, and gives the DigiDestined the ability to open up ports at any time and any location, rather than being limited to simply using the school’s computer lab to move in and out of the Digital World.