The Story of Nami
Nami is a Tidecaller — a role in her Marai tribe that has been passed down for generations, the individual responsible for the sacred exchange that keeps her people alive. The Marai live in Bilgewater's deep waters, and they are protected by a moonstone that the Tidecaller must renew through a bargain with the land-dwellers above: bring a moonstone from the surface, receive the renewed version. When Nami's predecessor died before completing the exchange, the duty fell to her.
No Marai had gone to the surface world before. They had strict laws against it, for reasons of safety and secrecy that Nami understood but found insufficient given the alternative. She went anyway. What she found on the surface was more complicated than any prohibition had prepared her for: a world full of people who didn't know she existed, who found her as strange as she found them, who were as varied in their willingness to help as any population is. She completed her mission. She also saw a world she can't unsee.
She returned to the deep, but the experience of the surface changes what she can be content with. She knows what exists above the water. She knows the moonstone exchange is necessary but that the isolation enforcing it may not be. She is now one of the people navigating between what her tribe needs and what she now knows the world contains — a negotiation she conducts every time she surfaces, which is more often than the Marai laws strictly permit.