Aroo is an Anouki who lives on the Isle of Frost in Phantom Hourglass.
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Right before Link lands on the Isle of Frost, a Yook violates the peace agreement between the Yooks and Anouki and kidnaps Aroo. He then disguises himself as Aroo and sets the whole village into an uproar because no one knows who the Yook disguised himself as. After Link restores peace by beating Gleeok in the Temple of Ice and frees Aroo, he is so grateful that he sends Link a letter which contains a Wisdom gem.