So the show is utterly mischaracterising most of the characters, but here are a few of the most egregious examples.
Book Percy: Kid with unmedicated ADHD who doesn't always keep his mouth shut; almost always has a witty comment prepared; not a Greek Myth expert but observant, intelligent, and cunning enough to make up for it; a highly opinionated teenager who often clashes with the people around him.
Show Percy: Annabeth's booktok dark romance boyfriend who is utterly obsessed with her and would never ever ever go against her in anything; dour and broody; a fucking encyclopedia of Greek Myth.
Book Annabeth: Intelligent and tactical but also often irrational and emotional; seems mature but has a childish side; also a highly opinionated teenager who often clashes with the people around her.
Show Annabeth: An absolute paragon of wisdom with no irrationality or adverse emotion to be found; a flawless badass who can do no wrong.
Book Grover: An awkward, anxious, downtrodden guy with low self-esteem who slowly learns to have faith in himself; usually the voice of peace between Percabeth's clashing natures.
Show Grover: Confident and bold; just as, if not more, sharp and witty as the rest of the trio.
And a bonus one that I haven't really seen anyone mention:
Book Dionysus: An irascible lout who shows utter contempt for Camp and everyone in it (this may be something of a façade but it's somewhat ambiguous); has a real vendetta against heroes and heroism; generally resentful and apathetic, with something of a sadistic streak, and entirely willing to flex his vast power.
Show Dionysus: Basically just Jason Mantzoukas playing himself; just kind of a silly guy who plays silly jokes; zero real threat felt from him.
Y'all seeing the problem here?
