Carter's 9-year-old sister, known for her intelligence and resourcefulness. She becomes a confident leader in challenging situations and uses her skills to help the group.

An 11-year-old who begins anxious and fearful but grows into his confidence, demonstrating his capability in unexpected situations. He is Vanessa's younger brother.

At 13, she is the oldest of the group and often takes on a responsible role, using her intelligence and skills with technology to aid the group, though not without making mistakes.

Carter and Jane's uncle, the seasoned captain of the Lucky Star, who introduces the children to nautical adventures. His optimism and bravery set an example for the children before he is separated from them during a storm.

Dex’s first mate on the Lucky Star, who assists in piloting the boat and makes sacrifices to ensure the group's safety during the storm, ultimately getting separated with Dex.