Some characters have their personalities toned down (like his step dad) and others ramped up (like Thalia). There were a lot of changes made in how old the actors representing the characters are too, compared to the movie. We have a lot of racially diverse re-casting, but mostly in a 1:1 swap without retconning the character backgrounds to factor in race, despite plenty other liberties to the plot that were taken. My favorite recasting is for Grover, whose actor, Aryan Simhadri, is Telugu Indian. There are other explicit attempts to add more diverse main characters in the literary cannon, but they don't come up until the later books. I still remember the thrill I felt as a kid when Riordan added lore for China, even if it may not have been done with best practice.
#PercyJackson #AsianAmerican