Sam Ichijouji

Sam Ichijouji was Ken Ichijouji's older brother. He was a Grade-A student and got most of the attention from his parents. One day, when Ken and him were sitting in his room, a Digivice which was meant for Ken came out of the computer. Sam thought that it was for him and told Ken not to touch it but Ken took it and was transported to the Digital world. Later, Sam scolded Ken for breaking his trust and Ken found himself angrily wishing that Sam would disappear. Later on, Sam died, leaving Ken to feel guilty. This guilt and envy for his brother, along with the Dark spore, pushed for Ken to become the Digimon Emperor.

in the Drama CD "Digimon Adventure 02: Original story, Summer 2003" Ken describes Sam as being cold and always in a bad mood. Ken reasons that it was because he was forced to grow up too quickly.