The 6th One Piece Film, Baron Omatsuri and the Secret Island, strives to analyze and question one of the staples of shonen writing: the "because I have friends" motivation that many MCs utilize to propel themselves forward. Characters like Luffy or Goku are presented to us as a sort of wild animal, simple-minded brutes with uncanny instincts to compensate their apparent stupidity. Secondary characters inevitably gravitate towards their magnetic ability to just perceive the best course of action, and their bigger-than-life goals are all but stated to be an inevitability. Under the umbrella of such a personality, side characters are assured and able to thrive at the cost of becoming less and less relevant, which shonen tells us, it's the strongest friendship possible.
What Baron Omatsuri asks is, what if those instincts were wrong? What if the shonen logic wasn't enough? What if there were consequences to the reckless, carefree idealism of shonen protagonists? What's left when brute-forcing your way through your goal causes a loss that you cannot ever undo? Was your cause so important? Were your friends that important?
After losing his entire crew because of a reckless wager to prove himself, Luffy is shown at his weakest. He's barely saved from certain death by a little character called Brief, a former captain of a similarly erradicated pirate crew called the Moustache Pirates. A short, middle aged man who now lives underground in an elaborate bunker, hiding from the assassin of his crew. It's him who gives Luffy a spark of hope regarding his friends, and in the final confrontation with the Baron (another mirror to Luffy's grief, and the one who was incapable of letting go of his bonds) Luffy gives Brief the official Moustache salute, thus counting himself the first of his renewed crew. This detail is usually ignored by the film's analists and fans alike, but it's unprecedented by characters usually defined by boundless individuality and magnetism such as him. 1/2