BUR #31557 has been approved by @nonamethanks.
create implication ahiru_(duck)_(princess_tutu) -> ahiru_(princess_tutu)
create implication princess_tutu_(character) -> ahiru_(princess_tutu)
create implication princess_kraehe -> rue_(princess_tutu)
The protagonist of the anime Princess Tutu, Ahiru, has three different forms.
Here's an image of them together: post #163631
(from right to left) Ahiru, Princess Tutu and Ahiru (duck form).
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As for Rue, her alter ego is Princess Kraehe. See official art below for reference: