Traffy's precision and Luffy's chaos isn't just about opposites attracting for shipping—it forces writers to actually build something. A good LawLu fic, for me, hinges on whether the author lets Luffy's emotional intelligence, which is massive in canon, actually rub off on Law's trauma. The best ones have Law slowly accepting that he doesn't need to orchestrate every single thing, that letting go doesn't mean losing control. Luffy's growth is quieter in these stories; he learns to read silences, to understand that some wounds aren't fixed with meat and a party, but with just being there. The dynamic pushes both beyond their archetypes. I've dropped fics where Law stays a brooding edge-lord the whole time; that's missing the point. The growth is in the friction, not just the fluff.
And crossover AUs! Putting them in a modern university or a fantasy setting strips away the pirate context, and you see if their core dynamic—Law's calculated care meeting Luffy's instinctual loyalty—still holds up. When it does, that's when you know the character growth is rooted in something real, not just the fandom's favorite tropes.