Kotarō Yanagisawa – ‘Assassination Classroom’
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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. 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.