#1 Lionel Messi
Lionel Messi is widely regarded as one of the best, if not the best, footballers in the world, as well as the greatest to have ever graced the game. He has won a record-tying five Ballon d'Or awards - four of them were won consecutively, too. Add to that his record five European Golden Shoes and you start to see why Messi is thought of in this manner.
Messi has broken innumerable records, not just for Barcelona, but in world football. For instance, his club-record of 32 trophies, which includes nine La Liga titles and four Champions League trophies is a reflection of how much he has contributed to the side over the years.
He has been with the club his whole career, having switched to their youth academy when he was 13 years old from Newell's Old Boys in Argentina. Messi has shown no interest in leaving the club, either, and looks set to see out the rest of his days at the Nou Camp, solidifying himself as the best player to have ever played for Barcelona.