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The leader of the sea monsters who is beat on taking over the marine world.
He is always depicted drinking wine, and wearing black. His resemblance to Kaito made the latter a subject of initial ire by Rina. He is known in the anime as Gaito (ガイト). (There is no definite reason for the name change, but one obvious reason is to distinguish him from J-Pop star Gackt, whose name is spelled the same way in katakana. In the Del Rey manga translation, his name is spelled Gackto in order to emphasize the comparison between the character and the singer.)