Duck or Ahiru (あひるAhiru/Duck) is the female protagonist and the main character of the Princess Tutu (プリンセスチュチュ Purinsesu Chuchu) series. She was a friendly, kind-hearted duck until she was given a magic pendant, then was turned into a teenage girl. This pendant also allows Duck to turn into her alter-ego, the wise and graceful Princess Tutu.Ahiru was a yellow duckling until she saw a Heart Shard dancing by itself and looking lonely. Hearing her desire to bring him happiness, she was given a pendant by Drosselmeyer which gave her the ability to transform into princess tutu. If Ahiru removes the pendant or quacks while talking, she transforms back into a duck and must touch water while wearing the pendant to return to her human form.
Later on, to save Mytho, her pendant gave her the power to transform into Princess Tutu. Because she is now a part of Drosselmeyer's story, Ahiru/Tutu would turn into a speck of light and vanish if she confessed her love to Mytho. Nonetheless, Ahiru continued to transform to help return his missing heart shards back to him.
