One scene that just destroys me every rewatch is Luffy wrapping his arms around Usopp after the whole Going Merry funeral and accepting him back into the crew without a word. That's it, that's the growth. Remember how he was on Usopp's home island? He almost ditched Usopp for lying. But here, after all the water under the bridge and losing the ship they fought over, there's zero 'I told you so,' zero lectures. He just sits there and hugs his friend who is coming home broken. The fight at Water 7 was pure, hot-headed principle—captain can't back down, crewmate challenged him, that's the code. But the return? That's Luffy learning that some bonds are stronger than the code, that forgiveness doesn't need a ceremony. He's not just a captain enforcing rules anymore; he's becoming a leader who understands the weight of heartbreak over pride. It's a quiet scene, but it shows how much he'd grown to carry the crew's pain, not just his own.
Another moment is him punching Charlos. Sure, it feels like a classic Luffy impulsive move on the surface. But look at the context: he's seen slavery, he's seen celestial dragons treat people like property, and he's seen Hancock's trauma. The old Luffy from East Blue might have punched a villain for hurting his friends. This Luffy punches a symbol of a whole oppressive system because it's morally repugnant, even before it directly threatens his crew. The anger isn't just personal; it's evolved into a sense of justice. He's developing a worldview, understanding that some evils are so big you smash them first and ask questions never.