Lucy is an alien girl who lacks expression and has no friends. In the anime, she introduces herself to Takaki's class as 'Ruuko Kirei na Sora,' which translates to 'beautiful sky.' She meets Takaki in the sixth episode, although she appears in an earlier episode without speaking. She refers to herself as 'Ru,' the name of her home planet and its inhabitants, and calls Earth and its people 'Uu.' She greets others by reaching for the sky and saying, 'Ru!' Himeyuri Sango, in particular, enjoys mimicking Lucy's greeting. Lucy has a cat that nearly drowns in the sixth episode but is saved with Takaaki's help; Lucy summons a thunderbolt that splits a tree, creating a bridge for Takaaki to cross and lift the cat from the raging river. Lucy calls this stray cat 'the Nya,' stating it is a special species capable of enjoying the true taste of food, and like Ru, Nya is alone on Uu. Lucy likes to cook the Nya fish broiled over a charcoal clay pot, which she considers the best cooking device available on Uu. Apparently, matchsticks serve as currency on Ru, with one being sufficient to buy a whole rocket engine. Lucy irritates the cafeteria cook at Takaaki's school by attempting to treat Takaaki to the best meal the cook can prepare, paying first one, then two matchsticks. However, Lucy somehow successfully purchases her charcoal clay pot and fish to broil using matchsticks. Lucy says that on Ru, it is said that the only good Uu is a dead Uu, but Takaaki is a special Uu.
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