Zoro .He was the only one that was actively trying to achieve his dream before he met Luffy.
Usopp would remain a coward in his home town
Nami would remain with Arlong and never get to sail the world and draw maps
Sanji abandoned his dream to find all blue and would have gone on to become the head chef
Chopper would have never left drum and would have never made a cure of all diseases
Robin would have stayed with Crocodile and would have had no reason to travel the world and uncover the history
Franky would have stayed in w7 and never built a ship to sail the world
Brooke would have stayed in the triangle never to see the sunshine ever and never see lagoon
Jinbei would have stayed s a shichibukai or under a yonko to protect FM
Usopp would remain a coward in his home town
Nami would remain with Arlong and never get to sail the world and draw maps
Sanji abandoned his dream to find all blue and would have gone on to become the head chef
Chopper would have never left drum and would have never made a cure of all diseases
Robin would have stayed with Crocodile and would have had no reason to travel the world and uncover the history
Franky would have stayed in w7 and never built a ship to sail the world
Brooke would have stayed in the triangle never to see the sunshine ever and never see lagoon
Jinbei would have stayed s a shichibukai or under a yonko to protect FM