Yuno Gasai (我妻 由乃, Gasai Yuno) is the main female protagonist of the Future Diary series. She is the Second in the Survival Game] 
Yuno's personality is ambiguous. For the most part she is sweet, feminine, and sometimes shy when around Yukiteru. But, this masks her dark and sanguinary side—ruthless, cold and calculating. She has little, if any, problem with using and taking advantage of others for her goals: her and Yukiteru's survival. She will resort to cruel and usually violent methods