Who is Jaimy Fletcher from Under the Jolly Roger: Being an Account of the Further Nautical Adventures of Jacky Faber and what is their importance?

Jaimy Fletcher is a young man who is in love with Jacky. He is from a well-to-do family and met Jacky aboard a ship. Jaimy is loyal to Jacky despite the fact that she's so headstrong. When Jaimy learns his mother was overly rude to Jacky, he packs up and leaves home though it means leaving his family's fortune behind.