Aru Akise is one of Yukiteru Amano's friends, and later becomes one of the main characters of the series. Akise is very intelligent and dreams to be a world famous detective when he gets older. Investigating the connections between Yuki and the diary owners, Akise becomes a close ally to Yuki, but an enemy and rival to Yuno Gasai. Akise quickly grows to love Yuki, and wishes for him to become God. He is the main character of the spin-off manga Future Diary: Paradox, where he and Muru Muru replace Yuki and Yuno in the survival game after Muru Muru accidentally kills Yuno Gasai while Yukiteru is injured.