#this is purley from an in-story view where he's supposed to be the bad guy

[my-pjo-stuff]

Hot Take: Luke's fatal flaw should have been a sense/drive for justice. He has been shown to get angry for the behalf of others multiple times when they were done wrong. He rages and hates perceived injustice, and wants to make it right. It makes one righteous, and fight for the right thing. Yet if you overdo it it'll easily have you adopt a "The Ends Justify The Means", making you focused purely on getting your justice. And the the possible damage in your wake. IDK I just think it would feel the theme of fatal flaws a lot better, and also have Luke parallel Percy more. Their flaw is a generally positive trait, the danger comes from overdoing it.