From the Super Mario Wiki
Sugar is the human owner of Club Sugar. He appears in WarioWare: Twisted! during Jimmy T.'s story. In Club Sugar, Sugar serves Jimmy T. and his parents dinner, but they are too distracted with their cellphones to notice. Later, Sugar attempts to inform them that their food is cold, but they continue to ignore him. Eventually, he gets fed up with the family, who has done nothing but play with their cell phones until closing time, and kicks them out. According to the description of the Pet Cat souvenir, he also owns the white cat that appears in the souvenir and in Cat Nap. The cast credits for WarioWare: Touched! also list him (as Sugar the Club Owner), though he does not make any appearance in that game.
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