A friendly and kind-hearted duck, Ahiru was turned into a human girl by Drosselmeyer with the use of a magical pendant. When Ahiru removes the pendant or quacks while talking, she is turned back into a duck. She must then touch the water in order to return to her human form. Like a duck, Ahiru is easily excitable, clumsy, and talkative.
Korean cosplayer Dayu makes a really cute Ahiru! And I really love her expression in this photo! Please visit her World Cosplay account for more of her cosplays! Thanks again to Lain for sending this in!
Source: Dayu on World Cosplay