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

Robin Raeburne is senior midshipman until Jacky's arrival. He stands up to Captain Scroggs when the captain plans to rape Jacky. When Jacky is about to leave the Wolverine, Robin pleads with her to marry him. She kisses him goodbye.