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Kai is the protagonist of MÄR OMEGA.
An ÄRMsmith's fosterling who admires Ginta for his deeds in the 2nd MÄR-Heaven war. He always wants an ÄRM as powerful as Babbo, but is incapable of using any, as commented by his foster father, for his character is too hesitant. It later turns out Kai has very strong magical power, suggestive of his ancestral relation to the wizards. It is later revealed that he is a descendant of Babbo, which makes him able to wield Babbo. In reality, he is Babbo's son, having been revived and sent to the future at the end of the war between Unwetter and Babbo.