One of the Future Diary owners and participants of the “Diary Game”, Gasai Yuno is so obsessed of Yuki that she has absolutely no concern for anyone else’s safety. Incidentally, she is also the owner of the Yukiteru Diary, a stalker diary which gives her the details of whatever Yuki’s doing in the present 10 minutes. And because the diary’s focus is on Yuki, it does not specify anything about Yuno unless it has something to do with Yuki.
Her eyes are really creeping me out. Those contact lenses really work well for this character. Thanks to 4chanatic for sending this in!