Basically, as a slime boy, Sui would eat anything, and when he ate another-world trash from the online supermarket, a contract between Mukoda and Sui was established. Sui also tasted Mukoda's food and is a gourmet of his dishes. Formerly, Sui could not speak words as a slime, but later obtained the ability to talk. Sui is a special individual whose normal size is a bowling ball, and the color is light blue. Specializing in water magic, and recovery medicine generation, it is a useful monster.