If you're looking for anime similar to One Piece, you might like these titles. All recommendations are made by Anime-Planet users like you!
Samurai Champloo is all about style, from the dj-style scratching scene changes to the hip-hop-inspired soundtrack to the eclectic character design. Mugen's fighting style is a funky meld of capoeira and limb-cutting, and Jin is the dramatic foil; he is all steel and old-school samurai style. What binds them together is the desire to test each other's abilities, and a promise to a girl named Fuu: to find the samurai that smells of sunflowers, who plays a pivotal role in her past. Together they travel through edo-era Japan, finding battle and comedy wherever they stop.
Five years have passed since Goku and his friends defeated Piccolo Jr. and restored peace to the planet. Gohan - Goku's son - and a variety of good, bad, and morally ambiguous characters are back, and perpetually not ready for action! Aliens, androids, and magicians all hatch evil plots to destroy the world and it's up to Goku to save the Earth once more - that is, once he and his comrades train plentifully in preparation. Enemies will become friends and power levels will rise to unimaginable levels, but even with the help of the legendary Dragon Balls and Shen Long will it be enough to save Earth from ultimate destruction?
Recca dreams of one day becoming an excellent ninja, but in this day and age ninjas are only talked about in history lessons. While playing his ninja games, he meets a mysterious woman that reveals to Recca his past, his bond with the powerful Hokage clan, and the special flame power that resides within him. Meanwhile, the evil Kurei has plans to gather the madougu from the Hokage clan so that he may take control over the elemental powers, but Recca is determined to master his flame and stop Kurei’s evil plans. Does he have what it takes to live up to his own expectations and put a stop to Kurei himself?
Hitomi was just a normal high school girl, until she was taken by the mysterious Van Fanel and dropped into a world of romance, magic and giant sword-wielding armor suits! Now Van, pilot of the famed armor suit Escaflowne; and Hitomi, whose hobby of predicting the future just became a frightening reality, must work together and fight the advanced technology of Zaibach: a force who want to shape Gaea to their visions of "peace". Follow Hitomi in her struggles against both these forces who seek to conquer this world, and her own confused heart.
Like adventures where the main thing is fighting, romantic feelings and caring towards other people who have had sad pasts and humorous yet very dramatic fights and events? Well then, you would like this anime because of the similarities and the action! The world of One Piece is full of fantasy, monsters, adventure, tragedy and comedy too! If you liked Escaflowne then check out One Piece or vice versa.
In a bizarre fantasy world, students known as meisters are trained at the illustrious Shinigami Weapon Meister University; but the tools they wield are no ordinary weapons! Each meister is paired with a human-like being who can transform into a weapon at will; and after defeating a pre-kishin - a human whose soul has darkened - the weapon eats the soul within it. A meister's ultimate goal is to collect ninety-nine pre-kishin souls and one of a witch so that his or her partner will become an all-powerful Death Scythe. Maka and her partner Soul Eater; Assassin Black Star and his partner Demon Blade Tsubaki; and Shinigami's son Death the Kid and his partners the Demon Twin Pistol Thompson Sisters each vie for their ultimate goal, but plenty of challenges and adventures lie in their way!
There's an element of similar weirdness that permeates both One Piece and Soul Eater. Although the two anime don't share many plot points (apart from their quintessential shounen-ness), they both have a tone of over-the-top antics. People with weird and powerful abilities battling other people with weird and powerful abilities, the whole dominated by personalities that are so weird as to make the rest of the story seem almost vanilla normal.
If you like a series where every other battle makes you scratch your head, thinking: "How are they ever going to top that for weirdness?", then these are the anime for you.