DAT CHARACTER IS AMAZING!

Yuno Gasai (我妻 由乃, Gasai Yuno) is in love with Yukiteru. His condition and actions are recorded every ten minutes in her "Yukiteru" diary while also providing small commentary made by Yuno in some of the entries. Its most obvious weakness is that it does not show Yuno's future at all — her condition, situation, or surroundings — unless it somehow involves Yuki or her own Dead End. Working with the First's "No Difference" diary, however, covers both of their diaries' individual flaws; as it has been said, the two make for a perfect combo, both in theory and in practice.
Smart, beautiful, and diligent; those who don't truly know Yuno would simply see the model student role she plays while at school. In truth, she is secretly obsessed with Yukiteru and her continued interaction with him leads her mind to become increasingly unstable, to the extent of kidnapping and confining him. She can be quite clingy and is highly fond of stalking him. When obstacles arise that either endanger Yukiteru's life or threatens their relationship, her thoughts turn murderous and she lets nothing get in the way of her path. Yuno is also able to quickly analyze and adapt to unexpected situations that may arise, and she puts thoughts into action without hesitation, performing what needs to be done without ever losing her nerves. These traits make her one of the strongest players in Deus' game, despite having the weakest diary for providing self survival aid. And while Yukiteru is credited for triggering the greatest shift in future occurrences, Yuno is the one who has created the largest influence in those events. Despite her strengths, however, she does process a rather unstable, antisocial and possessive personality; going so far as to kill anyone who tries getting close to Yuki. She would have gone as far as killing Yukiteru's mother, had she not approved of their relationship. Yuno tends to carry around a utility knife with her at all times, though she will make use of other weaponry such as kitchen knives, hatchets, etc, when required.