Izumi Kōshirō

Profile:
He is partnered with Tentomon. Koushiro is a computer nerd and spends all his time trying to figure stuff out on his "PiBook" laptop. He played on the soccer team with Takenouchi Sora and Yagami Taichi. Koushiro lives with his adopted parents. When he initially found out, he began to subconsciously distance 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.

He is the bearer of the Crest of Knowledge. He is one of the core members of the Chosen Children in both seasons. His color is purple and element is electricity.

Prelude to Digimon Adventure
He saw the battle between Parrotmon/Greymon, resulting in him becoming a Chosen Child.

Digimon Adventure
Koushiro was the brains of the group and many times and he frequently helped the group out of difficult situations. He is the owner of the Crest of Knowledge, mostly because the fact he is not only extremely smart but also has a hunger for the truth. Koushiro discovered at a young age that he was an adopted child when he overheard a conversation one night between his foster parents. It was discovered that Koushiro's biological parents had died in a car crash.

Digimon Adventure: Our War Game
In Our War Game, Koushiro is the one who first discovers a DigiTama infected with a computer virus on the internet, and then rushes off to alert the others. At first only successful in finding Taichi, he plays a key role as the brains behind the attacks that were implemented by Taichi and Yamato.

Between Digimon Adventure and Digimon Adventure 02
In May 2000, Koushiro arrived at the Digital World and gave up his Crest power to free the Four Holy Beasts. As a result, Tentomon lost the power to evolve to Perfect.

Digimon Adventure 02
Although he grew, he is still short compared to the other Chosen Children - he is only as tall as the new soccer team. Koushiro seems to have a lot of free time and often stops by the computer club at the elementary school to help the new Chosen Children in almost every episode. He is still into computers and is curious about the D-3 Digivice and other items the new Chosen Children have access to.

According to Inoue Miyako, he is somewhat revered as the former president of the school's computer club.

Digimon Adventure 02: Diablomon Strikes Back
Like in Our War Game Koushiro still was responsible for the planning and execution of the attacks on Diablomon. He was the one who gathered all the Chosen Children (including Tachikawa Mimi who flew in from America) to help defeat Diablomon and stop the havoc it wreaked on the net and the real world.

Digimon Adventure 02: Series Finale Epilogue
By the year 2027, Koushiro sets up a research team to study more of the Digital World than what the human population already knows. He has a daughter, with a Motimon, but her mother was not revealed.