Kotaro Yanagisawa

Kotaro Yanagisawa initially known as Shiro, is a mysterious scientist responsible for creating the tentacles, which establishes him as the main antagonist of the series. Once a proud scientist, Shiro wants to kill Korosensei for taking advantage of his experiments and ruining his life two years ago. Shiro is an influential character, as the repercussions of his research make him both directly and indirectly responsible for many major events, including the destruction of the moon and the creation of Korosensei. During his first appearance, he seems funny and easygoing, although it soon becomes...