Koushiro "Izzy" Izumi

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Koushiro "Izzy" Izumi
(泉 光子郎 Izumi Kōshirō)

Koushiro "Izzy" Izumi t

Koushiro "Izzy" Izumi (02) t

Koushiro "Izzy" Izumi (02 - Summer) t

Appears in:Digimon Adventure/02
Digimon Tamers (Games)
First appearance Digimon Adventure [M1]
Last appearance Adventure 02: "A Million Points of Light" [50]
Voice actor(s):(Ja:) Umi Tenjin
Unspecified actress[1] (Movie)
(En:) Mona Marshall
Digivice(s):Purple Digivice (when digivolving to Ultimate)
Trait(s):Knowledge (知識 Chishiki?)
Age Adventure / 02:
(Ja:) 10 / 13[2]
(En:) 9[3] / 12
Grade Adventure / 02:
(Ja:) 4th[4] / 7th
(En:) 4th / 8th[5]
Gender Male
Known relatives Masami Izumi (Adoptive father)
Kae Izumi (Adoptive mother)
Nationality Japanese Jp flag
Occupation DigiDestined
Digital World Researcher

Koushiro "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. He is the bearer of the Crest of Knowledge. He is one of the core members of the DigiDestined in both seasons.


In 1995, Izzy is a small boy with light skin, short, spiky red hair, thick eyebrows and dark eyes. He wears orange pajamas, and brown adult-sized slippers. Digimon Adventure

In 1999, Izzy is older, but very short for his age. He wears an orange button-up shirt with rolled-back sleeves, olive green shorts, light yellow gloves, light green socks, and purple and gray shoes with a lightning motif. Digimon Adventure

After taking a bath in Devimon's illusionary mansion, he wears a blue bath robe over his underwear, which is later revealed to be an illusion. Evil Shows His Face

On March 4, 2000, Izzy wears a blue shirt under an open orange button-up shirt, light brown shorts, blue socks, and dark blue shoes. Our War Game!

In May 2000, when Gennai summons him back to the Digital World, Izzy wears an orange T-shirt with a white lightbulb line drawing on a grey square, dark green pants, dark red sneakers with black soles and laces and light yellow wristbands. Fusion Confusion

In 2002, Izzy is finally taller, though still somewhat shorter than most teenage boys his age, and has cut his hair short. He usually wears the Odaiba Middle School uniform; a white buttoned shirt with long sleeves under a closed green blazer jacket, a dark blue tie, gray pants, white socks, and purple and grey shoes. Digimon Adventure 02

During summer, he wears a short-sleeved orange shirt with horizontal lines under an open green short-sleeved collared shirt. He also wears brown shorts and purple shoes with bright purple soles and a bright purple stripe motif. Ghost of a Chance He is also seen wearing Odaiba Middle School's summer uniform: a white short-sleeved buttoned shirt with the Odaiba Middle School symbol on the left breast, light green pants, and a light blue tie. The Samurai of Sincerity

During winter, he wears a dark red shirt with horizontal stripes, black raglan sleeves and a black collar. He also wears light brown pants and purple shoes with bright purple soles. Outside, he wears a green hoodie with white lining inside the hood and a large front pocket. A Very Digi-Christmas While in Hong Kong, he wears his hoodie tied around his waist. Digimon World Tour, Pt. 1

On March 2003, Izzy wears an orange shirt with a thin green rectangle on the chest, green raglan sleeves and an orange collar, as well as light brown pants and brown shoes. Digimon Adventure 02: Revenge of Diaboromon

In 2027, Izzy is an adult, though he remains the shortest of the male DigiDestined. His hair is now straightened and he has longer bangs which are combed to the left. He wears an olive green button-up shirt with rolled-back sleeves and dark green pants. At work, he wears a light blue coat with a mandarin collar and grey pants. A Million Points of Light


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!"


Kōshirō Izumi (泉 光子郎)

Name used in the Japanese version of Digimon Adventure, Digimon Adventure 02, and related materials. First name written as Kōshirō in his room. The Eighth Digivice Full name romanized as Koshiro Izumi in Digimon Adventure: Official Encyclopedia II.

  • Ja: Izumi (?). Japanese surname that means "fountain".
  • Ja: Kōshirō (光子郎?). Masculine Japanese name that means "bright son". The first two characters can also mean "photon", likely a reference to Tentomon, who uses electrical attacks.
Koushiro "Izzy" Izumi

Name used in the English dub of Digimon Adventure.

  • Koushiro. Alternate romanization of "光子郎".
  • Izzy. Similar to "Izumi".



Izzy's real parents died in a car crash. He was then adopted by Masami Izumi, a distant relative of Izzy's father, and his wife Kae.[citation needed]
M1 Izzy

Izzy witnesses the battle between Greymon and Parrotmon.

In 1995, Izzy lives in Highton View Terrace. One night that year, he witnesses the battle between Greymon and Parrotmon. Digimon Adventure This event caused him to be chosen to be among the new DigiDestined. The Ultimate Clash The destruction created by the battle caused it to be labeled a terrorist attack, and the Izumi's moved away from the area. Return to Highton View Terrace

One night, when he couldn't sleep, he overheard his parents talking about him being adopted. Kabuterimon's Electro Shocker

Izzy is the computer whiz of the group, and the most curious of the Digital World. He often prefers to be alone. Once in the Digital World, Izzy develops an "alien theory" and has a low opinion of the Digimon. For instance, when his partner, Tentomon, hears about Izzy’s alien theory, he asks, "What mystery is there to me? I am who I am." When the DigiDestined enter a factory, Izzy finds a large battery and enters. He wipes away a part of the hieroglyphics on the inner wall, causing the factory to stop production. Izzy becomes the first to realize that everything, even the program, is living in the Digital World.

Izzy’s skills with the computer, however, soon prove to be extraordinarily useful for the group. During the battle against Andromon, Tentomon suggests that Izzy reenter the program that activated his Digivice. When Izzy retypes it in, Tentomon digivolves into Kabuterimon and defeats the black gear in Andromon. When Mimi and Tentomon run into a maze, Izzy pulls out the map and locates Mimi’s location. He then directs her out of the maze.

After the defeat of Devimon, the DigiDestined are sent to the continent of Server to defeat Etemon. While they are in the capacity of Piximon, Matt and Izzy see that their tags are glowing. They sneak out and find their crests; Matt receives the Crest of Friendship, while Izzy receives the Crest of Knowledge. Izzy’s curiosity and deductive reasoning comes in handy once again; when Datamon captures Sora, he is the first to theorize that Datamon is still inside the pyramid. Tai and Izzy rescue Sora. Etemon learns of their presence and goes down there to destroy those kids. In the final ensuring battle, Greymon successfully digivolves into MetalGreymon and defeats Etemon. Tai and his Digimon are sucked into the Real World; during their short stay there, Izzy sends a frantic transmission, warning Tai not to go back to the Digital World.

However, Tai reenters the Digital World anyway, because he knows that he must restore the balance between the two worlds. Izzy runs into Vademon, who tricks him into giving up his curiosity and regresses him to an accepting mind that does not question anything. Tentomon frantically tries to get him back to no avail; he slowly reverse digivolves back into Motimon and Pabumon before Izzy snaps out of it. Izzy gets his tag and crest and his curiosity back. In the ensuring battle, Kabuterimon digivolves into MegaKabuterimon and defeats Vademon.

During the search for the Eighth Child, the DigiDestined pursue Myotismon into the Real World. Gennai loads a couple of programs into Izzy’s laptops that gives him much information. The first program tracks the movement of Digimon; Izzy sees Raremon attacking Tokyo Bay and rushes out there with Tentomon to stop him. The second program puts up a digital barrier, which stops the Bakemon from taking Izzy and his parents away. Gennai also tells Izzy that the source of Myotismon’s power is in the Fuji TV station and describes the prophecy to him. The prophecy aids them in defeating VenomMyotismon; when Izzy reads the prophecy out loud (it took the DigiDestined some time to figure it out), the group follows its lines. Angemon and Angewomon hit Matt and Tai with arrows of hope and light, which leads to Agumon and Gabumon warp digivolving into their Mega forms, which is of tremendous aid in the battle.

During this saga, Izzy’s parents reveal to him that he was adopted. Izzy’s real parents were killed in a car accident, and his father’s distant cousin adopted Izzy. Izzy also reveals that he found out when he overheard a late-night conversation, and says that he retreated into computers to try to forget about what he had overheard.

Izzy’s computer becomes a more valued asset as the DigiDestined battle the Dark Masters. Before, their Digimon partners used to describe the information about the various Digimon that they encountered; now, Izzy has loaded a database of Digimon profiles. When a new Digimon shows up, Izzy names and describes the characteristics to the rest of the DigiDestined. However, against Machinedramon it was more of a hindrance as it allowed him to track their movements around the city.

In the last battle against Piedmon, Izzy was turned into a key chain. After Apocalymon was defeated, Izzy calculated that, because one day in the Digital World equaled just one minute in the Real World, the DigiDestined could stay in the Digital World for 118 years. However, Gennai tells them that the time distortion was fixed with the defeat of Apocalymon, and that the solar eclipse would seal the barrier for an indefinite amount of time. Izzy says goodbye to Tentomon, thanking him for being a good friend.

In May 2000, Izzy arrived in the Digital World and gave up his Crest power to free the Digimon Sovereigns. As a result, Tentomon lost the power to become MegaKabuterimon.

In Our War Game, Izzy is the one who first discovers a digi-egg infected with a computer virus on the internet, and then rushes off to alert the others. He comes over to Tai's house to watch the battle unfold. He is deluged with the number of e-mails coming in, and frantically begs their audience to stop sending them, as their lag is slowing WarGreymon and MetalGarurumon down. Meanwhile, Izzy continues to eat all of Mrs. Kamiya's cooking, despite Tai's warnings. This eventually gives him indigestion at a crucial point, so that he's out of the room when Tai accidentally freezes the computer.

Later, after WarGreymon and MetalGarurumon DNA Digivolve into Omnimon and take out all of Diaboromon's clones, however, the remaining Diaboromon is too quick for Omnimon, always jumping away just as Omnimon spots it. Izzy finally comes up with a plan, forwarding all of the emails to Diaboromon to slow him down. Omnimon manages to destroy Diaboromon just seconds before the nuclear missiles would have hit Japan.

Three years later, Izzy is now in high school and is 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 Ichijouji’s base; with Cody Hida’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.

Izzy is seen upgrading his computer during the opening theme, and in the original version he is kidnapped along with the other original DigiDestined and de-aged. Digimon Hurricane Landing!!/Transcendent Evolution!! The Golden Digimentals

In March 25, 2003, Izzy is responsible for the planning and execution of the attacks on Diaboromon. He is the one who gathers all the DigiDestined to help defeat Diaboromon and stop the havoc it wreaked on the Internet and the Real World. He is able to decipher Diaboromon's plan to send Kuramon into the Real World and sends the DigiDestined to go capture them. Revenge of Diaboromon

KoushiroEpilogue1 KoushiroEpilogue2

By the year 2027, Izzy sets up a research team with Jim Kido and Haruhiko Takenouchi to study more of the Digital World than what the human population already knows. He has a daughter, with a Motimon. A Million Points of Light


PSP game

When Machinedramon is revived by Apocalymon, Izzy refuses to give up and tells Tai that he and Tentomon will fight, and causes Tentomon to warp digivolve to HerculesKabuterimon.

Other appearances

Digimon Tamers: Digimon Medley

Digimon World Re:Digitize: Decode

Taiga can fight Izzy in the Colosseum.


Main article: Koushiro "Izzy" Izumi

Notes and references

  1. The credits for Digimon Adventure (Movie) list Ai Nagano, Shizuka Okohira, Syoko Kikuchi, and You Sugimoto as voicing "Children" without specifying roles.
  2. In the Japanese version of Adventure 02, it is stated the show starts in the first day of the school year, which in the real-world format of the Japanese class system would imply that he was instead age 12 at the start of the series.
  3. Digimon: Digital Monsters - The Official First Season
  4. Digimon Adventure, "Adrift? The Island of Adventure!" [01]
  5. Digimon: Digital Monsters - The Official Second Season
  6. Digimon Adventure: Our War Game!
  7. Digimon Adventure ending 2: Keep On
  8. Nicktoons Digimon Characters: Izzy

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