Monkey D. Luffy (Captain) http://en.wikipedia.org/wiki/Monkey_D._Luffy
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some of you may know but luffy and his older brother Portgas D. Ace may be related to Gold Roger becuase his real name is Gol D. Roger
Nami (Navigator) http://en.wikipedia.org/wiki/Nami
Usopp (Sniper/Backup Captain) http://en.wikipedia.org/wiki/Usopp
Sanji (Cook) http://en.wikipedia.org/wiki/Sanji_%28One_Piece%29
Tony Tony Chopper (Doctor) http://en.wikipedia.org/wiki/Tony_Tony_Chopper
Nico Robin (Archaeologist) http://en.wikipedia.org/wiki/Nico_Robin[spoiler][/spoiler]