To me, Yuno is the character with the best development. Even better than Yukiteru, who is the main character if you could call him that, I'd say Yuno and Yukiteru are the main characters.
yuki future yuno Mirai diary nikki and
Anime and Manga portal. Regretting her selfish actions, she warned Yuno that the memories were harsh and painful, but Yuno happily accepted them, believing that they would allow her to find the person in her dreams. Yukiteru Amano is a year-old shy, daydreaming loner who observes life and jots down the events on his cell phone.
Retrieved March 10, March 23, Yukiteru manages to shoot Kurusu, despite his own Diary predicting Yuno's death instead. The two decide to have breakfast as the only one remaining is Kamado who is under Akise's guard and as such easy to reach.