Drosselmeyer

ドロッセルマイヤー

He is likely one of the most indirectly involved characters in the series. In reality, he is the cause of every event that occurs. It appears that Drosselmeyer wrote the story, The Prince And The Raven. Consequently, he is the creator of the Prince, Knight, Princess Tutu, and Princess Kraehe.
He is the one who originally gives Ahiru the ability to become a human girl, and later, the pendant that transforms her into Princess Tutu. Drosselmeyer observes every event unfolding in their world, intervening when his puppet, Edel, cannot ensure that things follow the story's flow accordingly.