ザイド・ジブラン

The younger brother of the third queen of the Shamsu kingdom. Though he is a member of the royal family, he didn't show any arrogance and walked around the palace freely. He met Will in the harem's courtyard, and treats him very kindly. He has a desire to find out more about the special medicine used by the royal family, and tries to talk with Will about it. [translated from official site]