Kurona is an artificial one-eyed ghoul who impeded Ken Kaneki's pursuit of Madam A alongside her twin sister Nashiro. After being abandoned by Akihiro Kanou, she vanished until her reappearance during the Rushima Landing Operation. She is revealed to have merged with her sister Nashiro, having become the gruesome creature known as Floppy. (Source: Tokyo Ghoul Wikia, edited)