ファフナー

A girl with a supernatural atmosphere and wizened eyes. Her true identity is that of a powerful dragon. By the power of magic, she can take human form depending on the situation. The dragon population is extremely small, and there are few dragons of royal blood left. Fafner is one of the few survivors, and although she is still young as a dragon, she has inherited the position of Dragon King. She has accepted her doom and lives a quiet life in the mountainous region known as “Dragon's Nest". She is a philosophical thinker, unperturbed by trivial matters, and has an enlightened outlook on everything. She is oblivious to the conflict between humans and elves, and takes on the role of bystander for their affairs. [From official site]