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Synsei Inc is a YouTuber who makes videos on the popular anime and manga series One Piece. He makes theories, world, character, and ability discussions, and talks about certain what if scenarios. He's collaborated with many other Anime YouTubers, such as Tekking101, Nux Taku, Joy Boy Theories, Ohara, and RogersBase, among many others, especially during his video I Ask Youtubers For Their CRAZIEST One Piece Theories | FT Nux Taku, BDA LAW & More.