Aru Akise

A classmate in Yukiteru's school. Aru Akise dreams of one day becoming the world's greatest detective.

The student detective is able to correctly deduce the culprit behind the serial dog murders even before the police. He is mistaken for being a future diary holder due to his quick wits and superior deduction abilities. An additional evidence of his supernatural intelligence is shown through few arcs, where only Akise is able to compete against Yuno's analytical, deceptive mind. His physical powers is nothing to scoff at either as he is able to overpower and out maneuver a psychotic Yuno in two encounters.

His reason for involving himself with Yukiteru and the diary affair is left vague at first, but as he participated in the investigation of the diary holders and worked with Masumi and Minene, and after revealing himself to be apart Nishimija's plan to eliminate 11th, Akise calls a meeting at his house and reveals his intentions of wanting Yukiteru to become god, yet stating his deep distrust of the Second, Yuno. Currently he is speaking with Deus in order to bring to light the Second's intentions.

It is revealed that Akise is just a character Deus created to keep tabs on the Diary holders. When Deus decides to 'dismantle' Akise and return his soul to the heavens, Akise activates his Detective Diary which allows him to remain as human.

He later faced Yukiteru and Yuno in a final showdown. He was able to figure out Yuno and fake Yuno's secret, but couldn't tell Yuki due to Yuno cutting his throat. He managed to give Yuki the message through his cellphone even after Yuno decapitated him. It is revealed by Yukiteru that the truth he discovered was that the Yuno everyone knows is a Yuno form a parallel world that was already destroyed, and that Yuno won the survival game in that world. Using her powers, she leaped through time and space and got to that world. This truth helps Yukiteru to reveal Yuno's true colors.

In chapter 17 of Future Diary, Akise admits in secret to Yuno that he likes Yukiteru beyond friendship, leading her to panic momentarily when he purposely wraps his arm around Yukiteru's waist to aggravate her. This might be one of the reasons why Yuno is so anxious and aggravated whenever Akise appears infront of Yukiteru. Finally, in chapter 48, Akise admist to Deus that he is in love with Yukiteru, however Deus revealed that he only made him believe he did. Akise, desperate to prove his independence from Deus' will, claims a future diary and returns, attempting to convince Yuki that Yuno is using him. Yuno attempts to kill Akise, but his diary's power allows him to foresee her actions and guard against them.