He is also likely the boy shown in Danganronpa/Zero who used a chair and beat another boy, most likely Shōji Yokō, to death with it. However, he was ambushed by another council member, most likely Asukasei Hino, getting glass shards in his eyes blinding him before he is eventually killed by an unspecified female Student Council member, possibly Suzuko Kashiki, with a clever.
Daiki has very dark brown eyes and greenish-gray hair. He wears the standard uniform of Hope's Peak Academy.
Daiki is shown to be worried about the killing game but still tries to calm everyone else down. He also seems to be pretty level-headed and logical as he first tried to see if the remaining student council could make a run for it (in the dub) believing the odds of them all dying to be slim.
As with the rest of the student council, Daiki was shown threatening videos by Junko Enoshima and he, alongside the other fourteen showed up at a classroom. on the fifth floor of Hope's Peak Academy to meet up with her. When she tells them to kill each other at first he and the rest of the council are reluctant to even when the vice president, Kotomi Ikuta, was murdered in front of them by Mukuro Ikusaba. However, they eventually did after Karen killed Ryota, an action which kickstarted the events of the The Tragedy of Hope's Peak Academy.
Daiki was murdered off-screen during the killing game.
During the Tragedy of Hope's Peak Academy, a boy (likely Daiki) is shown beating another boy (likely Shoji) to death with a chair. However, he was ambushed by another student council member, most likely Asukasei, getting glass shards in his eyes blinding him before he is eventually killed by an unspecified female Student Council member, possibly Suzuko Kashiki, with a clever.
- His given name, "Daiki" (大器) means "Great Vessel", a person of outstanding talents who can accomplish a great cause.
- His last name, "Kubo" (久保) means "for a long time" (久) and "protect" (保).
- In Danganronpa/Zero, a boy (presumably Daiki) claims he killed two students before killing another one. However, this does not match the killing order seen in Danganronpa 3. It is possible that he only injured them, believing he killed them.