Shannon

A changeling, a fairy child swapped and raised by humans. Unaware of his true nature, he lived as a human for over 50 years but was shunned by those around him due to his unnaturally slow aging. One day, he learned of his true identity and moved to the fairy realm. As a result, he has a very methodical and human-like personality. In the human world, he lived as a doctor, and he uses that knowledge to treat fairies, including administering care to a critically injured Chise.