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Mytho Used to be Blonde
In episode 5 we see a picture of an old man telling a boy (that we can assume to be Mytho because the print on the previous page mentions "the Prince" talking to an old man) about Princess Tutu. In the picture, the boy's hair is colored a faint yellow.
Also, if we look at Mythos eyebrows (yes, I am referencing his eyebrows) we can see that they appear to be a very pale brown.
Mytho 's hair was probably blonde ( maybe turned sandy brown as he grew up), and then after fighting decades with the raven, his hair turned white from old age. even though he never grew older in any other way.
Drosselmeyer Used to be Married to a Ballerina
Drosselmeyer had children; therefore, we'll assume that he was married. His wife died before him, and he was devastated. To help cope with the sadness, he started writing the "Prinz und Raben" and had used ballet in the story to honor her.
Duck is a Duckling and Not Native to Germany
Most (if not all) ducks, that start off yellow, later lose their downy feathers and grow new ones with different colors. Duck probably still has her downy and is therefore still quite young ( either that or it's an artistic choice.)
Also, no duck's native to Germany have pure yellow feathers as ducklings. (that I could find) Likely, Duck was brought in by a foreign family and lost. This would also explain her lack of knowledge of the towns history, and her surprise at seeing Mr. Cat. If she had grown up outside of Kinkan Town, she would not be used to the world warping weirdness of Drosselmeyer's powers.
Anywhoosies, I hope you like my headcanons and a good day everyone!