Ouji Kosaka

Ouji Kosaka
Ouji Kosaka (高坂 王子, Kōsaka Ouji)
Gender	Male

Another one of Yukiteru's classmate, Ouji Kosaka (高坂 王子, Kōsaka Ouji) is in Yuki and Yuno's classroom during the previous semester and is one of the first people to betray him during the terrorist bombing incident. He writes down a list of all of his proudest accomplishments in a blog he dubs the "Kousaka King Diary", often using the phrase "I'm Shining!" after each sentence. Due to having blogged many times on his cellphone, which is connected to the Eighth's diary, he becomes a "Apprentice Diary Owner". His diary helps him save his friends, but since it does not reveal what is happening around him, Yuno is able to shoot him with a crossbow. Since he is inadvertently working as the Eighth's spy, Yuki destroys his diary in chapter twenty-seven, though does not die because it was not a true future diary. Later on, when the 11th connects the 8th's diary to Holon, he receives a new diary, the "Neo-Kousaka King Diary," which instead of revealing what he will do, it reveals what people around him will do; the journal entry is ended by saying that they are "shining like he is." He was among the team to take down the 11th but was taken hostage and rescued by Yuno. Currently, he defends the 8th from Yukiteru along with Hinata and Mao.

Interestingly, in a special chapter of the main series, Ouji Kousaka appears to have bullied Yukiteru Amano prior to the survival game. If considered canon, this contradicts Yukiteru's indifferent behavior towards Ouji in the first chapter of the series.