Fritz Robinson, the oldest of the Robinson boys. He grows up on the island to become a gentlemanly, courageous young man. He learns how to accept responsibility and to carry out difficult tasks requiring initiative and courage. Unlike his father, he wants to return to Europe and does so when the opportunity comes.
Emily Montrose, a young English girl shipwrecked on the island. She is rescued by Fritz, who brings her to his family’s settlement. Emily is the daughter of an English army officer and is on her way home from India. She and Fritz fall in love and plan to marry upon their return to Europe.
Jack Robinson, the third of the Robinson children. He contributes to the family’s welfare by helping his mother tend the animals and crops.