Derkeshai

Derke (short for Derkeshai ) is a dragon who was once trapped in the form of a hamster by Marian. He teaches Marian magic. He is still able to breathe a limited amount of fire in hamster form.

Starting from the second season premiere 2-part episode "Robin and the king", Marian manages to somewhat partially undo the spell that has trapped him in his hamster form.

Now, whenever he feels positive emotions or is in a good mood, he reverts back to his dragon form. However, this also works vice versa. If he ever gets angry or feels negative emotions, such as despair, then he'll turn back into his hamster form.

Essentially, as long as he feels positive emotions, then he can stay in his dragon form indefinitely.

In his dragon form (which is his true form), Derke has red scales, white bushy eyebrows, a white tuft of hair that resembles a goatee, white cheek tufts and a tuft of white hair on his head. He has a dark red nose and white fangs, as well as turquoise blue/green eyes. His tongue is mint green. His hands and feet are both dark red, and his underbelly and wing membrane are pale red. His ears have pale red-pink canals and have dark red tips. He has small wings which allow him to fly and a large tail with white spikes on it.

In his hamster form, Derke has cream fur with a white belly, white eyebrows and a large tuft of fur on his chin that resembles a beard and turquoise blue eyes. He also has darker cream canals in his ears and a dark brown nose.

Both Es in his name are pronounced short, except for Princely Flight where Marian pronounces it as a long vowel sound (like "derkEE") but the captions still spell it "Derke".