Digimon Season 1-5

Koushiro "Izzy" Izumi

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Izzy is the computer expert 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 MetalGreymonand 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, his knowledge and heart allow his crest to glow and 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 laptop 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 toAgumon 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 laptop 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.

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 (they planned to remain there for the rest of the summer holiday). 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.

Izzy's Digivice & Crest of Knowledge

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Tentomon's Digivolution 

Pabumon - Fresh Level

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Pabumon is Tentomon's fresh form. He is a green-colored blob who has a yellow pacifier in his mouth. Pabumon appears in Digimon Adventure when Vademon took away Izzy's curiosity and Crest, causing Tentomon to gradually lose power. Tentomon De-Digivolved into Motimon, and then to Pabumon. 
Attack

Bubble Blow: An attack that involves firing adhesive bubbles from the mouth.

Motimon - Training Level

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Motimon is Tentomon's In-Training form. Motimon is a cylinder-shaped pink blob with shining black eyes, a curvy smile and two arms which have three developing claws on each. Tentomon was in this form when Izzy first came into the Digital World. Motimon is seen again when Izzy loses his crest to Vademon and he continues to return to this form whenever he finishes battling in his Ultimate form AtlurKabuterimon. In addition, this form resembles one of the ghosts from Pac-Man.
Attack

Bubble Blow: Motimon fires bubbles from his mouth.

Tentomon - Rookie Level

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Tentomon appears like a ladybug. He has six legs in total, the front being long arms with gray claws at the end. He has large, green eyes and two yellow antennae reaching out from his head. His wing-case is covered with black spots. Tentomon first appears in Digimon Adventure when Motimon Digivolved into Tentomon to protect Izzy from a Kuwagamon. Tentomon greatly admires his partner, Izzy, for his curiosity and intelligence. He is easy-going and likes to mess around.
Attacks
Super Shocker: Tentomon fires a rod of electricity from his antenna.
Rhino Spin: Tentomon rolls and surrounds himself with electricity.

Kabuterimon - Champion Level

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Kabuterimon is Tentomon's champion form. Kabuterimon is a more developed insect than Tentomon, and is modeled after the rhinoceros beetle. He has four arms, two legs and has now developed a skull helmet which covers his eyes. Two pairs of large wings extend from between his shoulder blades, out further and higher than the rest of his body. Kabuterimon first appeared in the episode 'Kabuterimon's Electro Shocker' when he freed Andromon from the power of the Black Gear. He was also involved in battles against DevimonEtemon, and LadyDevimon. 
Attack

Electro Shocker: Kabuterimon fires a ball of electricity at enemies.

MegaKabuterimon - Ultimate Level

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MegaKabuterimon is Tentomon's Ultimate form. He debutes when Izzy and Kabuterimon faced Vademon. MegaKabuterimon was also involved in several battles against Myotismon's henchmen and later, Myotismon himself.
Attack

Horn Buster: MegaKabuterimon fires an electric blast from his horn.