Is this one piece or something else ?

[YoDiggetySam]

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[The7thHokage]

Its either a spinoff or that thing they do when they bring in characters from one manga/anime to the other.

 

[kmrasengan]

His swords are different so I don't think that's OP, and Zoro also looks a bit odd.

 

[Cruciatus]

It might be one of the earlier movies.

 

[Rokudaime Hokage Naruto]

That's Zoro if Kuina didn't die.

 

[Kuroba Kurohime]

That's baby Beel all grown up.

 

[Fireplay]

Lol what. Thats definately Zoro and Nami there. Its probably from the earlier episodes or a movie or something. Thats what Zoro looked like in the earlier episodes.

 

[Xlad]

That's definitely One Piece.

 

[Hexuze]

Yup it is OP. In fact, it's from the OVA, "One Piece - Defeat Him! The Pirate Ganzack." The animation was a bit different, here's one of the fights:

[video=youtube;Z7rD-muiXrY]http://www.youtube.com/watch?v=Z7rD-muiXrY[/video]