If you're looking for anime similar to One Piece Movie 6: Baron Omatsuri and the Secret Island, you might like these titles. All recommendations are made by Anime-Planet users like you!
In a future that never was, Goku has passed away from an illness and all of the Z-fighters, with the exception of Gohan, met their end at the hands of the Androids 17 and 18. Years have passed since then and the Androids have turned everything into chaos. The now grown up Trunks and his master Gohan are the only ones left to fight this menace...
One of DBZ's best specials, The History of Trunks tells an alternate future where Goku died of his viral heart disease and the andoids rule the world.
Like Baron Omatsuri and the secret island, this special is much more serious then the anime it is based off of, telling a grimm future that almost was in DBZ.
Definitively the best DBZ special around, The History of Trunks remains to this day a moving story of inevitiability that like DBZ itself, is unforgetable
Simon lives a boring life in the underground village of Jeeha, where his main job day in and day out is to dig tunnels. His close friend Kamina, however, longs to bust out of their oppressive existence and reach the surface world where open skies and adventure await! One day, during his usual digs, Simon discovers a robot with a big face buried amongst the rocks. No sooner has he shown Kamina his mysterious find when two beings from the surface crash land into Jeeha Village - one is a gun-toting woman calling herself Yoko and the other is a terrifying mecha piloted by a Beastman! Seeing their chance to escape village drudgery, Kamina rallies Simon and Yoko to defeat the invader using their new robot, Lagann. However, upon breaking out onto the surface world, Simon, Kamina, and Yoko encounter enemies more powerful than they could have envisioned. Their fight for adventure just turned into a war for the survival of the human race - will their lust for freedom hold out against such terrible odds?
Albert de Morcerf had it all: wealth, loving parents, great friends. The only thing lacking in his life was excitement... until that fateful day on Luna. After a chance encounter with bandits and a daring rescue, Albert invites his newfound friend and savior, the Count of Monte Cristo, to his home in Paris. Little does he know what fate has in store for him and his loved ones. Just who is the mysterious Count, and what does he want? As tragedy touches the lives of those around him, can Albert’s only recourse be to wait and hope?
If you are looking at recommendations for this one piece of the One Piece collection in particular (no pun intended) - then I would recommend Gankutsuou because what seperates this movie from other One Piece works is shared with Gankutsuou.
After being my favorite book, it is also my favorite anime. While it is far from Shonen. It contains very similar storyline elements and art styles.
I truly believe this movie's storyline is somewhat influenced by the Count of Monte Cristo (book) as was 100s of other fantastic works.
There are several things which make this movie unique from other One Piece works and I believe it is worthy of closer examination as it is also one of the only times that Luffy has levied a fatal blow on an enemy.
Similarities to the book (contains book spoilers)
Amazing story built on an amazing plot. Even if it is not influenced at all, the connections are uncanny eventhough I make it sound rather black and white. Please read Counte of Monte Cristo or watch Gankutsuou