The list with Kazuhiko Mashirito's name.
His name appeared on a list of names of people at KaibaCorp. Each name disappeared after Trueman sent them to the World of Darkness. Kazuhiko was the last victim on this list to be sent, leaving only Seto Kaiba.
The origin of his name is a nickname of Kazuhiko Torishima, who is a former editor in chief of the Weekly Shounen Jump.