Headcanons for Percy’s favorite Disney movie are based on the assumption that he Loves the ocean. Cool, fine. But then why would his favorite movie be The Little Mermaid? A movie about a girl who doesn’t like being in the water, who dreams of getting away from her family and home and being independent, and in the end chooses to leave the ocean permanently, to the point she even isolates her daughter from part of her identity? Doesn’t really make sense.
And Finding Nemo? As a kid that can actually talk to sea creatures, I think it’d be hard for him to watch because it’d be so inaccurate and he’d just end up annoyed, especially when specific sea creatures are portrayed as mean. Idk, I can almost see an argument for this but I just don’t think it fits as well as others.
But Moana? It’s about a girl who loves her island and her home. She loves her people. But yet? The sea calls to her. She connects to it. Even with all the love she has for her island, she feels the tug of the sea. She always finds herself back at the water’s edge. And I just think Percy would relate to that. To her love for her family and the ocean.