Out of everyone who had arrived in the story, Roxas takes the least amount of time to adapt to his mer form. And for obvious reasons; his Essence is the Little Mermaid, after all, and he's been getting used to having an underwater form since he arrived. However, rather than feel elated at being able to help the story from which his Essence originates, he instead feels an odd sense of unease.

He's read the story his Essence comes from, and knows how it's supposed to end. He knows of the fate of the Little Mermaid. So what does that mean for him? Would he be chosen to go through what she did? Would his Essence powers be affected if he sought to change the story? He wasn't sure.

When given the option, he will go to help with exploring the area around the palace. However, anyone who comes across Roxas will probably find him sitting on an underwater rock outcrop or floating through a coral reef bed. He's definitely distracted, staring off into the ocean or absently watching what little sea life is swimming around rather than actively exploring the area.