 If you liked
One Piece
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 ...then you might like
Rurouni Kenshin: Meiji Kenkaku Romantan
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Eiichiro Oda (the creator of One Piece) was once assistent to Nobuhiro Watsuki (the creator of Rurouni Kenshin), so this is a given. Similarities? They both have:
* Insanely powerful swordsmen (Zoro mostly)
* An entertaining cast of main characters
* A friendly main character
* A fiery female lead
* Both gangs fight injustice
* Sad backstories
* Similar tastes in gags
Differences: One Piece has less romance between main characters and focuses more on the adventure.