Baron Omatsuri and the Secret Island is the sixth One Piece
film in the long-running franchise, and notably the darkest of the films so far.
The film opens with the Straw Hats receiving a bottle with a note inside challenging the recipients with a strong crew to come to their island resort. Enticed by the promise of food, recreation, and (in Sanji's case) women, the crew heads for Omatsuri Island. At first it seems the place isn't as advertised as no one greets the crew upon arrival. Heading in further, they manage to find their destination. But the owner, the titular Baron Omatsuri, won't let them relax without taking the "Ordeals of Hell", nearly impossible tasks that seem suited only for the strongest.
The crew is initially against the tests, but Luffy, thrill seeker that he is, is more than happy to take em on. However there are other occupants on the island that aren't part of Omatsuri's group and the crew slowly begins to find out that something isn't exactly right about the island and its staff.
This film has the following tropes:
- Breaking the Fellowship: As the games go on, the crew seem to start fighting more and more with each other. This is intentional as the Baron wishes the break the spirit of pirate crews before he feeds them to Lily.
- Boom, Headshot: How Lily meets her end, not by Luffy, but the father of the Teacup Pirates who shoots an arrow through its head.
- Big Bad. Baron Omatsuri
- Conspicuous CG: A lot of it in this film especially the Goldfish Scooping game. One of the complaints against it that it didn't seem to mesh well with the 2-D animation.
- Covers Always Lie: This◊ is the cover for the DVD version. Though it was likely intentional, it couldn't be any further away from the truth.
- Darker and Edgier: While the previous film was much darker than its predecessors, this film went Up to Eleven in its edginess, resulting in some of the darkest and frightening images and soundtracks associated with the franchise.
- Dead All Along: All the inhabitants of the island, except Baron, Brief, and the Teacup Pirates, were members of Baron's former pirate crew who died in a storm long ago.
- Death from Above: Well not death, but Usopp wins the Straw Hats the second game but by dropping from a glider and slamming the the last of the Wise Men with his Usopp Hammer.
- The Dog Was the Mastermind: Lily, the innocent looking flower on Baron's shoulder, is behind the whole ongoings of the island. The Baron just acts on her will.
- Eldritch Abomination: Lily's true form◊, Good God. Even Luffy was horrified of the thing when it finally revealed itself (though probably more due to his crew grafted onto its body and still in the digestion stage).
- Freudian Excuse: The Baron lost his crew due to a storm and grew bitter from the loneliness afterwards. Seeing other pirate crews happy just reminds him of what he once had, so he figures if he can't be happy, no one will.
- Forced to Watch: A rather painful scene in which the Baron pins Luffy's limbs with his arrows as his crew is absorbed into the Lily Carnation and he's helpless to do anything about it. Brief likewise had this happen to him as well.
- Island With A Dark Secret: And how!
- Heroic BSOD: Luffy suffers one after his first battle with Omatsuri and failing to save his crew from being absorbed into Lily. Amusingly this was just a while before the Sabaody Archipelago Arc where a similar event happened. Forshadowing, perhaps?
- Hunting the Most Dangerous Game: The third game, Shooting, involves the Baron's crew hunting down the remaining Straw Hats through the island.
- Innocent Bystanders: The Teacup Pirates, a family consisting of a father, two daughters and a son who just wanted to come to the island to have fun. But wound up stranded there when they couldn't complete the Tests. The Baron has Lily try to eat them as a leftover after absorbing the other Straw Hats (save Luffy) but Chopper manages to rescue them at the cost of his own safety. They return the favor though by ultimately killing Lily, breaking the spell she has over the island and freeing the crew before they're devoured.
- Killed Off for Real: Baron is killed by Luffy, making him the first antagonist ever in the series to warrant Luffy to kill someone.
- Somewhat subverted in that he was already thriving on Lily to extend his lifespan.
- Megaton Punch: How Luffy finishes off the Baron, decking him so hard the color leaves the screen for a moment upon impact. This is the only time in all of One Piece where Luffy outright kills the antagonist.
- My Greatest Failure: Brief, one of the residents on the island who isn't part of the Baron's crew. He's the last remnants of the Mustache Pirates and was forced to watch his crew be eaten by Lily.
- Mood Whiplash: The first half of the movie is fairly slapstick typical of One Piece. Then the second half hits (beginning with Chopper's discovery of the graveyard) and all of that quickly goes bye-bye.
- Near Villain Victory: Omatsuri and Lily actually almost came close to winning despite taking a few hard hits, nearly killing Luffy with the below mentioned attack. It's not even Luffy who stops him but the Teacup Pirates. Luffy just finishes the Baron off once he's depowered.
- Plant People: All of the resort staff are just plant replicas of Omatsuri's crew powered by Lily. Feeding her strong pirates allows her to keep them going otherwise they'll shrivel up and turn into real plants.
- Rain of Arrows: Luffy takes a full brunt of this thanks to Lily. Amazingly he still manages to stay on his feet despite being a pincushion.
- Sore Loser: After the Straw Hats win the Goldfish Scooping game, Omatsuri instantly calls for another one.
- Strange Salute: Brief shows Luffy his, which involves putting a finger under his nose in representation of a mustache.
- Super Senses: Daisy, the youngest daughter of the Teacup Pirates, has "very good hearing" such a being able to hear the the conversation between Chopper and her father as well as the voices of the absorbed Straw Hats within Lily. It's implied, though never stated, that she has Kenbunshoku Haki (which at the time was known as Mantra).
- Villainous Breakdown: [[The Baron experiences this trope near the end after the father of the Teacup pirates shoots down Lily, since he needs the plant to keep his dead pirate crew alive.]]
- Took a Level in Jerkass: The Straw Pirates start getting hostile towards each other over the course of the movie. Turns out to be intentional since the Baron wanted to separate them and feed them to Lily.