Kouichi Kimura

Kouichi Kimura is the last member to join the team of Chosen Children and is Kouji Minamoto's older twin brother. Their parents divorced when they were very young, so they hardly knew about each other. Kouichi learned about Kouji when his grandmother told him on her deathbed. He ran after Kouji, who was on his way to the Digital World, to try and catch up with him but he fell down a flight of stairs and ended up in a coma as a result. His mind was taken into the Digital World by Cherubimon, who saw his sadness. He erased Kouichi's memories and gave him the Human Spirit of Darkness to give him a semi-physical form as Duskmon until he was freed from Cherubimon's control. After this, he wielded the purified Spirits of Darkness and fought alongside his brother and the other Chosen Children.

Later on, Kouichi began to realize that, in reality, his mind was not truly in the Digital World. On multiple occasions, the Chosen Children were seriously injured, revealing their Digi-Code. However, each time Kouichi is far less hurt and reveals no Fractal Code. LordKnightmon informed him that he was only a ghost within the Digital World and this troubled him towards the end of the series. As the final battles with Lucemon ensued, Kouichi sacrificed himself to save the other DigiDestined, giving his spirits of darkness to his brother, Kouji. The powers of light and darkness begin to react within Koji's body, helping trigger Kouji and Takuya's final evolution into Susanoomon. In the final episode it is revealed by Loewemon that Kouichi is still alive but is badly hurt. In the end the other Chosen Children's D-Scanners were able to bring him out of his coma.