Most Popular One Piece Characters 

Jinbe

Knight of the Sea Jinbe is the captain and tenth crew member of the Straw Hats. Jinbe is a whale shark fish-man, and his specialty is (not surprisingly) fish-man karate.

Franky

It's no surprise that Frankie is also fondly known as Iron Man. He is the shipwriter of Straw Hats, and the eighth member of the crew.

Brook

Also known as the Soul King, Brooke is a musician of straw hats, and a swordsman. The ninth member of the crew, Brooke was once one of the Rumber Pirates.

Nami

The "Cat Burglar" is the navigator of the namesake Straw Hats, and is one of the core members. He is the brainchild of the crew in many ways. 

Usopp

"Lord" Usopp is a brave warrior of the seas—or so he likes to introduce himself. What we do know is that he is actually the 'warrior' of the sea; For the brave part, it's questionable.

Tony Tony Chopper

Tony Tony Chopper—depending on the narrative—either the genius doctor of the Straw Hats or their mascot.

Robin

Robin is the only Straw Hat who asked to join the crew instead of being invited by Luffy.

Sanji 

The Fallen Prince is another prominent member of the Sanji Strohts. Some would argue that his role as a cook is no less important than that of a sailor or archaeologist,

Zoro 

Roronoa "Pirate Hunter" Zorro is second in command and Luffy's right hand.

Luffy

And last, but certainly not least, Monkey D. Luffy is not. The man who aspires to be the pirate king and the goofy main protagonist of this series.