Carina Fathom is a major character in the later books and is the mother of Seth. She and Sean Ranger have a very friendly relationship and Seth (Carina's child) looks at Sean as a father figure. It is believed by many that she and Sean are more than friends.
Carina has short locks of brown hair. In island of dragons, when Kaylee is revealing whl everyone's ancestors might be based on their appearances, she says Carina looks more Eastern European, maybe Russian.